21494648 has 16 divisors (see below), whose sum is σ = 46060080. Its totient is φ = 9211968.

The previous prime is 21494639. The next prime is 21494659. The reversal of 21494648 is 84649412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191861 + ... + 191972.

It is an arithmetic number, because the mean of its divisors is an integer number (2878755).

Almost surely, 2^21494648 is an apocalyptic number.

21494648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21494648 is an abundant number, since it is smaller than the sum of its proper divisors (24565432).

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

21494648 is a wasteful number, since it uses less digits than its factorization.

21494648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383846 (or 383842 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 21494648 is about 4636.2320908255. The cubic root of 21494648 is about 278.0418134922.

The spelling of 21494648 in words is "twenty-one million, four hundred ninety-four thousand, six hundred forty-eight".