21341845872 has 80 divisors (see below), whose sum is σ = 61276450080. Its totient is φ = 7111922688.

The previous prime is 21341845853. The next prime is 21341845901. The reversal of 21341845872 is 27854814312.

21341845872 is a `hidden beast` number, since 21 + 3 + 41 + 8 + 4 + 587 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2906718 + ... + 2914050.

It is an arithmetic number, because the mean of its divisors is an integer number (765955626).

Almost surely, 2^21341845872 is an apocalyptic number.

It is an amenable number.

21341845872 is an abundant number, since it is smaller than the sum of its proper divisors (39934604208).

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

21341845872 is a wasteful number, since it uses less digits than its factorization.

21341845872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14087 (or 14075 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The spelling of 21341845872 in words is "twenty-one billion, three hundred forty-one million, eight hundred forty-five thousand, eight hundred seventy-two".