21355496 has 8 divisors (see below), whose sum is σ = 40041570. Its totient is φ = 10677744.

The previous prime is 21355483. The next prime is 21355501. The reversal of 21355496 is 69455312.

It can be written as a sum of positive squares in only one way, i.e., 20884900 + 470596 = 4570^2 + 686^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334711 + ... + 1334726.

Almost surely, 2^21355496 is an apocalyptic number.

It is an amenable number.

21355496 is a deficient number, since it is larger than the sum of its proper divisors (18686074).

21355496 is a wasteful number, since it uses less digits than its factorization.

21355496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669443 (or 2669439 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 21355496 is about 4621.2007097723. The cubic root of 21355496 is about 277.4405185934.

The spelling of 21355496 in words is "twenty-one million, three hundred fifty-five thousand, four hundred ninety-six".