21234392 has 24 divisors (see below), whose sum is σ = 40835100. Its totient is φ = 10351680.

The previous prime is 21234391. The next prime is 21234401. The reversal of 21234392 is 29343212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12659 + ... + 14237.

Almost surely, 2^21234392 is an apocalyptic number.

It is an amenable number.

21234392 is a deficient number, since it is larger than the sum of its proper divisors (19600708).

21234392 is a wasteful number, since it uses less digits than its factorization.

21234392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1622 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 21234392 is about 4608.0789923785. The cubic root of 21234392 is about 276.9150821212.

The spelling of 21234392 in words is "twenty-one million, two hundred thirty-four thousand, three hundred ninety-two".