21371845608 has 24 divisors (see below), whose sum is σ = 57882082050. Its totient is φ = 7123948512.

The previous prime is 21371845559. The next prime is 21371845609. The reversal of 21371845608 is 80654817312.

21371845608 is a `hidden beast` number, since 2 + 1 + 3 + 7 + 1 + 84 + 560 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13862236644 + 7509608964 = 117738^2 + 86658^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×21371845608³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21371845609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148415523 + ... + 148415666.

Almost surely, 2^21371845608 is an apocalyptic number.

It is an amenable number.

21371845608 is an abundant number, since it is smaller than the sum of its proper divisors (36510236442).

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

21371845608 is a wasteful number, since it uses less digits than its factorization.

21371845608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296831201 (or 296831194 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 21371845608 in words is "twenty-one billion, three hundred seventy-one million, eight hundred forty-five thousand, six hundred eight".