21472374 has 32 divisors (see below), whose sum is σ = 53542656. Its totient is φ = 5577120.

The previous prime is 21472313. The next prime is 21472379. The reversal of 21472374 is 47327412.

It is a super-2 number, since 2×21472374² = 922125690391752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472379) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 22777 + ... + 23700.

It is an arithmetic number, because the mean of its divisors is an integer number (1673208).

Almost surely, 2^21472374 is an apocalyptic number.

21472374 is an abundant number, since it is smaller than the sum of its proper divisors (32070282).

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

21472374 is a wasteful number, since it uses less digits than its factorization.

21472374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46500.

The product of its digits is 9408, while the sum is 30.

The square root of 21472374 is about 4633.8293019920. The cubic root of 21472374 is about 277.9457392849.

Adding to 21472374 its reverse (47327412), we get a palindrome (68799786).

The spelling of 21472374 in words is "twenty-one million, four hundred seventy-two thousand, three hundred seventy-four".