21254738 has 8 divisors (see below), whose sum is σ = 32981580. Its totient is φ = 10260880.

The previous prime is 21254729. The next prime is 21254789. The reversal of 21254738 is 83745212.

It can be written as a sum of positive squares in 2 ways, for example, as 20948929 + 305809 = 4577^2 + 553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183173 + ... + 183288.

Almost surely, 2^21254738 is an apocalyptic number.

21254738 is a deficient number, since it is larger than the sum of its proper divisors (11726842).

21254738 is a wasteful number, since it uses less digits than its factorization.

21254738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366492.

The product of its digits is 13440, while the sum is 32.

The square root of 21254738 is about 4610.2861082584. The cubic root of 21254738 is about 277.0034971125.

The spelling of 21254738 in words is "twenty-one million, two hundred fifty-four thousand, seven hundred thirty-eight".