21234708 has 36 divisors (see below), whose sum is σ = 58557408. Its totient is φ = 6434640.

The previous prime is 21234701. The next prime is 21234709. The reversal of 21234708 is 80743212.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26416 + ... + 27207.

Almost surely, 2^21234708 is an apocalyptic number.

It is an amenable number.

21234708 is an abundant number, since it is smaller than the sum of its proper divisors (37322700).

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

21234708 is a wasteful number, since it uses less digits than its factorization.

21234708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53644 (or 53639 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 21234708 is about 4608.1132798576. The cubic root of 21234708 is about 276.9164557534.

The spelling of 21234708 in words is "twenty-one million, two hundred thirty-four thousand, seven hundred eight".