21374372 has 12 divisors (see below), whose sum is σ = 39605580. Its totient is φ = 10058496.

The previous prime is 21374357. The next prime is 21374377. The reversal of 21374372 is 27347312.

It can be written as a sum of positive squares in 2 ways, for example, as 19589476 + 1784896 = 4426^2 + 1336^2 .

It is not an unprimeable number, because it can be changed into a prime (21374377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157097 + ... + 157232.

It is an arithmetic number, because the mean of its divisors is an integer number (3300465).

Almost surely, 2^21374372 is an apocalyptic number.

It is an amenable number.

21374372 is a deficient number, since it is larger than the sum of its proper divisors (18231208).

21374372 is a wasteful number, since it uses less digits than its factorization.

21374372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314350 (or 314348 counting only the distinct ones).

The product of its digits is 7056, while the sum is 29.

The square root of 21374372 is about 4623.2425850262. The cubic root of 21374372 is about 277.5222372137.

The spelling of 21374372 in words is "twenty-one million, three hundred seventy-four thousand, three hundred seventy-two".