221000312021 has 8 divisors (see below), whose sum is σ = 224137145088. Its totient is φ = 217864150000.

The previous prime is 221000312017. The next prime is 221000312111. The reversal of 221000312021 is 120213000122.

It is a happy number.

221000312021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221000312021 - 2² = 221000312017 is a prime.

It is a super-2 number, since 2×221000312021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221000311987 and 221000312005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000512021) 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 7 ways as a sum of consecutive naturals, for example, 515171 + ... + 841071.

It is an arithmetic number, because the mean of its divisors is an integer number (28017143136).

Almost surely, 2^221000312021 is an apocalyptic number.

It is an amenable number.

221000312021 is a deficient number, since it is larger than the sum of its proper divisors (3136833067).

221000312021 is an equidigital number, since it uses as much as digits as its factorization.

221000312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335523.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 221000312021 its reverse (120213000122), we get a palindrome (341213312143).

The spelling of 221000312021 in words is "two hundred twenty-one billion, three hundred twelve thousand, twenty-one".