21524274 has 24 divisors (see below), whose sum is σ = 48664512. Its totient is φ = 6862680.

The previous prime is 21524273. The next prime is 21524281. The reversal of 21524274 is 47242512.

It is not an unprimeable number, because it can be changed into a prime (21524273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25582 + ... + 26409.

It is an arithmetic number, because the mean of its divisors is an integer number (2027688).

Almost surely, 2^21524274 is an apocalyptic number.

21524274 is an abundant number, since it is smaller than the sum of its proper divisors (27140238).

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

21524274 is a wasteful number, since it uses less digits than its factorization.

21524274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52022 (or 52019 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 21524274 is about 4639.4260420875. The cubic root of 21524274 is about 278.1694962095.

Adding to 21524274 its reverse (47242512), we get a palindrome (68766786).

The spelling of 21524274 in words is "twenty-one million, five hundred twenty-four thousand, two hundred seventy-four".