21458048 has 16 divisors (see below), whose sum is σ = 42748710. Its totient is φ = 10728960.

The previous prime is 21458033. The next prime is 21458069. The reversal of 21458048 is 84085412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19998784 + 1459264 = 4472^2 + 1208^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83693 + ... + 83948.

Almost surely, 2^21458048 is an apocalyptic number.

It is an amenable number.

21458048 is a deficient number, since it is larger than the sum of its proper divisors (21290662).

21458048 is an equidigital number, since it uses as much as digits as its factorization.

21458048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167655 (or 167643 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 21458048 is about 4632.2832383178. The cubic root of 21458048 is about 277.8839119879.

The spelling of 21458048 in words is "twenty-one million, four hundred fifty-eight thousand, forty-eight".