21055464270 has 128 divisors (see below), whose sum is σ = 59186304000. Its totient is φ = 5311785600.

The previous prime is 21055464263. The next prime is 21055464293. The reversal of 21055464270 is 7246455012.

It is a happy number.

21055464270 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 5 + 4 + 642 + 7 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4250295 + ... + 4255245.

It is an arithmetic number, because the mean of its divisors is an integer number (462393000).

Almost surely, 2^21055464270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21055464270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29593152000).

21055464270 is an abundant number, since it is smaller than the sum of its proper divisors (38130839730).

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

21055464270 is a wasteful number, since it uses less digits than its factorization.

21055464270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5815 (or 5809 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 21055464270 in words is "twenty-one billion, fifty-five million, four hundred sixty-four thousand, two hundred seventy".