21477878070 has 64 divisors (see below), whose sum is σ = 56452018176. Its totient is φ = 5186478080.

The previous prime is 21477878069. The next prime is 21477878083. The reversal of 21477878070 is 7087877412.

It is a super-2 number, since 2×21477878070² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41814 + ... + 211433.

It is an arithmetic number, because the mean of its divisors is an integer number (882062784).

Almost surely, 2^21477878070 is an apocalyptic number.

21477878070 is an abundant number, since it is smaller than the sum of its proper divisors (34974140106).

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

21477878070 is a wasteful number, since it uses less digits than its factorization.

21477878070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253525.

The product of its (nonzero) digits is 1229312, while the sum is 51.

The spelling of 21477878070 in words is "twenty-one billion, four hundred seventy-seven million, eight hundred seventy-eight thousand, seventy".