21881452770 has 48 divisors (see below), whose sum is σ = 58279391352. Its totient is φ = 5692734720.

The previous prime is 21881452741. The next prime is 21881452783. The reversal of 21881452770 is 7725418812.

It can be written as a sum of positive squares in 4 ways, for example, as 7526777049 + 14354675721 = 86757^2 + 119811^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2961277 + ... + 2968656.

Almost surely, 2^21881452770 is an apocalyptic number.

21881452770 is an abundant number, since it is smaller than the sum of its proper divisors (36397938582).

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

21881452770 is a wasteful number, since it uses less digits than its factorization.

21881452770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5929987 (or 5929984 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The spelling of 21881452770 in words is "twenty-one billion, eight hundred eighty-one million, four hundred fifty-two thousand, seven hundred seventy".