21102322021 has 16 divisors (see below), whose sum is σ = 23604916608. Its totient is φ = 18697996800.

The previous prime is 21102322009. The next prime is 21102322057. The reversal of 21102322021 is 12022320112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102322021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102321986 and 21102322004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102322001) 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 15 ways as a sum of consecutive naturals, for example, 457405 + ... + 501421.

It is an arithmetic number, because the mean of its divisors is an integer number (1475307288).

Almost surely, 2^21102322021 is an apocalyptic number.

It is an amenable number.

21102322021 is a deficient number, since it is larger than the sum of its proper divisors (2502594587).

21102322021 is a wasteful number, since it uses less digits than its factorization.

21102322021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45132.

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

Adding to 21102322021 its reverse (12022320112), we get a palindrome (33124642133).

The spelling of 21102322021 in words is "twenty-one billion, one hundred two million, three hundred twenty-two thousand, twenty-one".