1021022221 has 8 divisors (see below), whose sum is σ = 1046417400. Its totient is φ = 995650560.

The previous prime is 1021022213. The next prime is 1021022257. The reversal of 1021022221 is 1222201201.

It is a happy number.

1021022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 14546596 + 1006475625 = 3814^2 + 31725^2 .

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

It is not a de Polignac number, because 1021022221 - 2³ = 1021022213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021022201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109885 + ... + 118813.

It is an arithmetic number, because the mean of its divisors is an integer number (130802175).

Almost surely, 2^1021022221 is an apocalyptic number.

It is an amenable number.

1021022221 is a deficient number, since it is larger than the sum of its proper divisors (25395179).

1021022221 is an equidigital number, since it uses as much as digits as its factorization.

1021022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11759.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1021022221 is about 31953.4383282926. The cubic root of 1021022221 is about 1006.9588688151.

Adding to 1021022221 its reverse (1222201201), we get a palindrome (2243223422).

The spelling of 1021022221 in words is "one billion, twenty-one million, twenty-two thousand, two hundred twenty-one".