21021231022 has 16 divisors (see below), whose sum is σ = 34682666544. Its totient is φ = 9555103800.

The previous prime is 21021231019. The next prime is 21021231031. The reversal of 21021231022 is 22013212012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21021230987 and 21021231005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3945729 + ... + 3951052.

It is an arithmetic number, because the mean of its divisors is an integer number (2167666659).

Almost surely, 2^21021231022 is an apocalyptic number.

21021231022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021231022 is a deficient number, since it is larger than the sum of its proper divisors (13661435522).

21021231022 is an equidigital number, since it uses as much as digits as its factorization.

21021231022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7896816 (or 7896794 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21021231022 its reverse (22013212012), we get a palindrome (43034443034).

The spelling of 21021231022 in words is "twenty-one billion, twenty-one million, two hundred thirty-one thousand, twenty-two".