21139350 has 24 divisors (see below), whose sum is σ = 52425960. Its totient is φ = 5637120.

The previous prime is 21139337. The next prime is 21139379. The reversal of 21139350 is 5393112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21139350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70315 + ... + 70614.

It is an arithmetic number, because the mean of its divisors is an integer number (2184415).

Almost surely, 2^21139350 is an apocalyptic number.

21139350 is an abundant number, since it is smaller than the sum of its proper divisors (31286610).

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

21139350 is a wasteful number, since it uses less digits than its factorization.

21139350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140944 (or 140939 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 21139350 is about 4597.7548868986. The cubic root of 21139350 is about 276.5013205347.

The spelling of 21139350 in words is "twenty-one million, one hundred thirty-nine thousand, three hundred fifty".