21521697300000 has 1152 divisors, whose sum is σ = 81321495091200. Its totient is φ = 5531328000000.

The previous prime is 21521697299983. The next prime is 21521697300001. The reversal of 21521697300000 is 379612512.

21521697300000 is a `hidden beast` number, since 2 + 1 + 521 + 69 + 73 + 0 + 0 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21521697300001) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 32559299670 + ... + 32559300330.

It is an arithmetic number, because the mean of its divisors is an integer number (70591575600).

Almost surely, 2^{21521697300000} is an apocalyptic number.

21521697300000 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 21521697300000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40660747545600).

21521697300000 is an abundant number, since it is smaller than the sum of its proper divisors (59799797791200).

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

21521697300000 is an equidigital number, since it uses as much as digits as its factorization.

21521697300000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125 (or 1091 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 21521697300000 in words is "twenty-one trillion, five hundred twenty-one billion, six hundred ninety-seven million, three hundred thousand".