21024374 has 16 divisors (see below), whose sum is σ = 37939200. Its totient is φ = 8536104.

The previous prime is 21024373. The next prime is 21024379. The reversal of 21024374 is 47342012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39254 + ... + 39785.

It is an arithmetic number, because the mean of its divisors is an integer number (2371200).

Almost surely, 2^21024374 is an apocalyptic number.

21024374 is a deficient number, since it is larger than the sum of its proper divisors (16914826).

21024374 is a wasteful number, since it uses less digits than its factorization.

21024374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79067.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 21024374 is about 4585.2343451562. The cubic root of 21024374 is about 275.9991160792. Note that the first 3 decimals are identical.

Adding to 21024374 its reverse (47342012), we get a palindrome (68366386).

The spelling of 21024374 in words is "twenty-one million, twenty-four thousand, three hundred seventy-four".