21523048 has 64 divisors (see below), whose sum is σ = 45144000. Its totient is φ = 9580032.

The previous prime is 21523001. The next prime is 21523049. The reversal of 21523048 is 84032512.

It is not an unprimeable number, because it can be changed into a prime (21523049) 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, 241788 + ... + 241876.

It is an arithmetic number, because the mean of its divisors is an integer number (705375).

Almost surely, 2^21523048 is an apocalyptic number.

It is an amenable number.

21523048 is an abundant number, since it is smaller than the sum of its proper divisors (23620952).

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

21523048 is a wasteful number, since it uses less digits than its factorization.

21523048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21523048 is about 4639.2939117930. The cubic root of 21523048 is about 278.1642146953.

The spelling of 21523048 in words is "twenty-one million, five hundred twenty-three thousand, forty-eight".