21121400528 has 40 divisors (see below), whose sum is σ = 41630335488. Its totient is φ = 10378824192.

The previous prime is 21121400513. The next prime is 21121400561. The reversal of 21121400528 is 82500412112.

It is a super-2 number, since 2×21121400528² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121400497 and 21121400506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441425 + ... + 486927.

Almost surely, 2^21121400528 is an apocalyptic number.

It is an amenable number.

21121400528 is a deficient number, since it is larger than the sum of its proper divisors (20508934960).

21121400528 is a wasteful number, since it uses less digits than its factorization.

21121400528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46011 (or 46005 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The spelling of 21121400528 in words is "twenty-one billion, one hundred twenty-one million, four hundred thousand, five hundred twenty-eight".