21163374 has 12 divisors (see below), whose sum is σ = 45854016. Its totient is φ = 7054452.

The previous prime is 21163361. The next prime is 21163403. The reversal of 21163374 is 47336112.

21163374 is a `hidden beast` number, since 21 + 1 + 633 + 7 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 587854 + ... + 587889.

It is an arithmetic number, because the mean of its divisors is an integer number (3821168).

Almost surely, 2^21163374 is an apocalyptic number.

21163374 is an abundant number, since it is smaller than the sum of its proper divisors (24690642).

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

21163374 is a wasteful number, since it uses less digits than its factorization.

21163374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175751 (or 1175748 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 21163374 is about 4600.3667245123. The cubic root of 21163374 is about 276.6060249988.

Adding to 21163374 its reverse (47336112), we get a palindrome (68499486).

The spelling of 21163374 in words is "twenty-one million, one hundred sixty-three thousand, three hundred seventy-four".