21612152700 has 288 divisors, whose sum is σ = 74487107520. Its totient is φ = 5423293440.

The previous prime is 21612152671. The next prime is 21612152701. The reversal of 21612152700 is 725121612.

21612152700 is a `hidden beast` number, since 2 + 16 + 121 + 527 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612152701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3714994 + ... + 3720806.

It is an arithmetic number, because the mean of its divisors is an integer number (258635790).

Almost surely, 2^21612152700 is an apocalyptic number.

21612152700 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 21612152700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37243553760).

21612152700 is an abundant number, since it is smaller than the sum of its proper divisors (52874954820).

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

21612152700 is a wasteful number, since it uses less digits than its factorization.

21612152700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5865 (or 5840 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The spelling of 21612152700 in words is "twenty-one billion, six hundred twelve million, one hundred fifty-two thousand, seven hundred".