21439272750 has 64 divisors (see below), whose sum is σ = 61157071872. Its totient is φ = 4900404000.

The previous prime is 21439272749. The next prime is 21439272773. The reversal of 21439272750 is 5727293412.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 2036586 + ... + 2047085.

It is an arithmetic number, because the mean of its divisors is an integer number (955579248).

Almost surely, 2^21439272750 is an apocalyptic number.

21439272750 is an abundant number, since it is smaller than the sum of its proper divisors (39717799122).

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

21439272750 is a wasteful number, since it uses less digits than its factorization.

21439272750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083698 (or 4083688 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 21439272750 in words is "twenty-one billion, four hundred thirty-nine million, two hundred seventy-two thousand, seven hundred fifty".