21204102022 has 4 divisors (see below), whose sum is σ = 31806153036. Its totient is φ = 10602051010.

The previous prime is 21204102019. The next prime is 21204102037. The reversal of 21204102022 is 22020140212.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21204102022² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21204101987 and 21204102005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5301025504 + ... + 5301025507.

It is an arithmetic number, because the mean of its divisors is an integer number (7951538259).

Almost surely, 2^21204102022 is an apocalyptic number.

21204102022 is a deficient number, since it is larger than the sum of its proper divisors (10602051014).

21204102022 is a wasteful number, since it uses less digits than its factorization.

21204102022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10602051013.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21204102022 its reverse (22020140212), we get a palindrome (43224242234).

The spelling of 21204102022 in words is "twenty-one billion, two hundred four million, one hundred two thousand, twenty-two".