21204051036 has 48 divisors (see below), whose sum is σ = 56724858624. Its totient is φ = 6038937216.

The previous prime is 21204050969. The next prime is 21204051047. The reversal of 21204051036 is 63015040212.

It is a super-2 number, since 2×21204051036² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21204050997 and 21204051015.

It is a congruent number.

It is an unprimeable number.

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, 376950 + ... + 429533.

It is an arithmetic number, because the mean of its divisors is an integer number (1181767888).

Almost surely, 2^21204051036 is an apocalyptic number.

It is an amenable number.

21204051036 is an abundant number, since it is smaller than the sum of its proper divisors (35520807588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21204051036 is a wasteful number, since it uses less digits than its factorization.

21204051036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806810 (or 806808 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21204051036 its reverse (63015040212), we get a palindrome (84219091248).

The spelling of 21204051036 in words is "twenty-one billion, two hundred four million, fifty-one thousand, thirty-six".