1001212222021 has 4 divisors (see below), whose sum is σ = 1092231514944. Its totient is φ = 910192929100.

The previous prime is 1001212222019. The next prime is 1001212222037. The reversal of 1001212222021 is 1202222121001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001212222021 - 2¹ = 1001212222019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001212221986 and 1001212222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001212222921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45509646445 + ... + 45509646466.

It is an arithmetic number, because the mean of its divisors is an integer number (273057878736).

Almost surely, 2^{1001212222021} is an apocalyptic number.

1001212222021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001212222021 is a deficient number, since it is larger than the sum of its proper divisors (91019292923).

1001212222021 is an equidigital number, since it uses as much as digits as its factorization.

1001212222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91019292922.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1001212222021 its reverse (1202222121001), we get a palindrome (2203434343022).

It can be divided in two parts, 100 and 1212222021, that added together give a palindrome (1212222121).

The spelling of 1001212222021 in words is "one trillion, one billion, two hundred twelve million, two hundred twenty-two thousand, twenty-one".