21272494 has 4 divisors (see below), whose sum is σ = 31908744. Its totient is φ = 10636246.

The previous prime is 21272483. The next prime is 21272507. The reversal of 21272494 is 49427212.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5318122 + ... + 5318125.

It is an arithmetic number, because the mean of its divisors is an integer number (7977186).

Almost surely, 2^21272494 is an apocalyptic number.

21272494 is a deficient number, since it is larger than the sum of its proper divisors (10636250).

21272494 is a wasteful number, since it uses less digits than its factorization.

21272494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10636249.

The product of its digits is 8064, while the sum is 31.

The square root of 21272494 is about 4612.2114001854. The cubic root of 21272494 is about 277.0806109795.

The spelling of 21272494 in words is "twenty-one million, two hundred seventy-two thousand, four hundred ninety-four".