21654248 has 32 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 8436480.

The previous prime is 21654229. The next prime is 21654251. The reversal of 21654248 is 84245612.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16961 + ... + 18192.

It is an arithmetic number, because the mean of its divisors is an integer number (1581930).

Almost surely, 2^21654248 is an apocalyptic number.

21654248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21654248 is an abundant number, since it is smaller than the sum of its proper divisors (28967512).

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

21654248 is a wasteful number, since it uses less digits than its factorization.

21654248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35177 (or 35173 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 21654248 is about 4653.4125112653. The cubic root of 21654248 is about 278.7282803966.

The spelling of 21654248 in words is "twenty-one million, six hundred fifty-four thousand, two hundred forty-eight".