21025811399228 has 24 divisors (see below), whose sum is σ = 36939133996800. Its totient is φ = 10471843610928.

The previous prime is 21025811399167. The next prime is 21025811399249. The reversal of 21025811399228 is 82299311852012.

It is a super-2 number, since 2×21025811399228² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21025811399228.

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 7 ways as a sum of consecutive naturals, for example, 7618388 + ... + 10004571.

It is an arithmetic number, because the mean of its divisors is an integer number (1539130583200).

Almost surely, 2^{21025811399228} is an apocalyptic number.

It is an amenable number.

21025811399228 is a deficient number, since it is larger than the sum of its proper divisors (15913322597572).

21025811399228 is a wasteful number, since it uses less digits than its factorization.

21025811399228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17624129 (or 17624127 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 53.

The spelling of 21025811399228 in words is "twenty-one trillion, twenty-five billion, eight hundred eleven million, three hundred ninety-nine thousand, two hundred twenty-eight".