21445436160 has 108 divisors (see below), whose sum is σ = 74199015072. Its totient is φ = 5718779904.

The previous prime is 21445436137. The next prime is 21445436209. The reversal of 21445436160 is 6163454412.

21445436160 is a `hidden beast` number, since 2 + 14 + 454 + 36 + 160 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 919272 + ... + 942311.

Almost surely, 2^21445436160 is an apocalyptic number.

21445436160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21445436160 is an abundant number, since it is smaller than the sum of its proper divisors (52753578912).

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

21445436160 is a wasteful number, since it uses less digits than its factorization.

21445436160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861610 (or 1861593 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 21445436160 in words is "twenty-one billion, four hundred forty-five million, four hundred thirty-six thousand, one hundred sixty".