21445156152 has 72 divisors (see below), whose sum is σ = 67563194400. Its totient is φ = 6127186464.

The previous prime is 21445156133. The next prime is 21445156169. The reversal of 21445156152 is 25165154412.

21445156152 is a `hidden beast` number, since 2 + 1 + 4 + 45 + 1 + 561 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3035752 + ... + 3042807.

It is an arithmetic number, because the mean of its divisors is an integer number (938377700).

Almost surely, 2^21445156152 is an apocalyptic number.

It is an amenable number.

21445156152 is an abundant number, since it is smaller than the sum of its proper divisors (46118038248).

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

21445156152 is a wasteful number, since it uses less digits than its factorization.

21445156152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6078585 (or 6078571 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The spelling of 21445156152 in words is "twenty-one billion, four hundred forty-five million, one hundred fifty-six thousand, one hundred fifty-two".