21424013238 has 32 divisors (see below), whose sum is σ = 43859160576. Its totient is φ = 6972926688.

The previous prime is 21424013213. The next prime is 21424013257. The reversal of 21424013238 is 83231042412.

It is a Curzon number.

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, 866820 + ... + 891192.

It is an arithmetic number, because the mean of its divisors is an integer number (1370598768).

Almost surely, 2^21424013238 is an apocalyptic number.

21424013238 is an abundant number, since it is smaller than the sum of its proper divisors (22435147338).

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

21424013238 is a wasteful number, since it uses less digits than its factorization.

21424013238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27828.

The product of its (nonzero) digits is 9216, while the sum is 30.

The spelling of 21424013238 in words is "twenty-one billion, four hundred twenty-four million, thirteen thousand, two hundred thirty-eight".