21055023204 has 36 divisors (see below), whose sum is σ = 51850192464. Its totient is φ = 6648953328.

The previous prime is 21055023173. The next prime is 21055023221. The reversal of 21055023204 is 40232055012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2425842 + ... + 2434505.

It is an arithmetic number, because the mean of its divisors is an integer number (1440283124).

Almost surely, 2^21055023204 is an apocalyptic number.

It is an amenable number.

21055023204 is an abundant number, since it is smaller than the sum of its proper divisors (30795169260).

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

21055023204 is a wasteful number, since it uses less digits than its factorization.

21055023204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4860392 (or 4860371 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 21055023204 its reverse (40232055012), we get a palindrome (61287078216).

The spelling of 21055023204 in words is "twenty-one billion, fifty-five million, twenty-three thousand, two hundred four".