21437659152 has 640 divisors, whose sum is σ = 79994880000. Its totient is φ = 5456263680.

The previous prime is 21437659147. The next prime is 21437659157. The reversal of 21437659152 is 25195673412.

21437659152 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 7 + 6 + 591 + 52 = 666.

It is an interprime number because it is at equal distance from previous prime (21437659147) and next prime (21437659157).

It is a junction number, because it is equal to n+sod(n) for n = 21437659098 and 21437659107.

It is not an unprimeable number, because it can be changed into a prime (21437659157) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 59714749 + ... + 59715107.

It is an arithmetic number, because the mean of its divisors is an integer number (124992000).

Almost surely, 2^21437659152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21437659152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39997440000).

21437659152 is an abundant number, since it is smaller than the sum of its proper divisors (58557220848).

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

21437659152 is a wasteful number, since it uses less digits than its factorization.

21437659152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441 (or 415 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The spelling of 21437659152 in words is "twenty-one billion, four hundred thirty-seven million, six hundred fifty-nine thousand, one hundred fifty-two".