21056315053200 has 240 divisors, whose sum is σ = 77096298128256. Its totient is φ = 4812239462400.

The previous prime is 21056315053199. The next prime is 21056315053211. The reversal of 21056315053200 is 235051365012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65300370 + ... + 65622030.

Almost surely, 2^{21056315053200} is an apocalyptic number.

21056315053200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21056315053200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38548149064128).

21056315053200 is an abundant number, since it is smaller than the sum of its proper divisors (56039983075056).

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

21056315053200 is a wasteful number, since it uses less digits than its factorization.

21056315053200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329482 (or 329471 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The spelling of 21056315053200 in words is "twenty-one trillion, fifty-six billion, three hundred fifteen million, fifty-three thousand, two hundred".