21538026030400 has 84 divisors (see below), whose sum is σ = 57814914921120. Its totient is φ = 7832009459200.

The previous prime is 21538026030377. The next prime is 21538026030413. The reversal of 21538026030400 is 403062083512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 611858140 + ... + 611893339.

It is an arithmetic number, because the mean of its divisors is an integer number (688272796680).

Almost surely, 2^{21538026030400} is an apocalyptic number.

21538026030400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21538026030400 is an abundant number, since it is smaller than the sum of its proper divisors (36276888890720).

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

21538026030400 is a wasteful number, since it uses less digits than its factorization.

21538026030400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223751512 (or 1223751497 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 21538026030400 in words is "twenty-one trillion, five hundred thirty-eight billion, twenty-six million, thirty thousand, four hundred".