21153374 has 32 divisors (see below), whose sum is σ = 35721216. Its totient is φ = 9313920.

The previous prime is 21153373. The next prime is 21153409. The reversal of 21153374 is 47335112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166499 + ... + 166625.

It is an arithmetic number, because the mean of its divisors is an integer number (1116288).

Almost surely, 2^21153374 is an apocalyptic number.

21153374 is a deficient number, since it is larger than the sum of its proper divisors (14567842).

21153374 is a wasteful number, since it uses less digits than its factorization.

21153374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320.

The product of its digits is 2520, while the sum is 26.

The square root of 21153374 is about 4599.2797262180. The cubic root of 21153374 is about 276.5624513539.

Adding to 21153374 its reverse (47335112), we get a palindrome (68488486).

The spelling of 21153374 in words is "twenty-one million, one hundred fifty-three thousand, three hundred seventy-four".