21159014400 has 390 divisors, whose sum is σ = 78408773432. Its totient is φ = 5640192000.

The previous prime is 21159014369. The next prime is 21159014413. The reversal of 21159014400 is 441095112.

21159014400 is a `hidden beast` number, since 21 + 1 + 590 + 14 + 40 + 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 an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 8293125 + ... + 8295675.

Almost surely, 2^21159014400 is an apocalyptic number.

21159014400 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 21159014400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39204386716).

21159014400 is an abundant number, since it is smaller than the sum of its proper divisors (57249759032).

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

21159014400 is an equidigital number, since it uses as much as digits as its factorization.

21159014400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597 (or 2561 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 21159014400 in words is "twenty-one billion, one hundred fifty-nine million, fourteen thousand, four hundred".