21296575 has 6 divisors (see below), whose sum is σ = 26407784. Its totient is φ = 17037240.

The previous prime is 21296537. The next prime is 21296617. The reversal of 21296575 is 57569212.

It is a de Polignac number, because none of the positive numbers 2^k-21296575 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 425907 + ... + 425956.

Almost surely, 2^21296575 is an apocalyptic number.

21296575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21296575 is a deficient number, since it is larger than the sum of its proper divisors (5111209).

21296575 is an equidigital number, since it uses as much as digits as its factorization.

21296575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851873 (or 851868 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 21296575 is about 4614.8212316405. The cubic root of 21296575 is about 277.1851256328.

The spelling of 21296575 in words is "twenty-one million, two hundred ninety-six thousand, five hundred seventy-five".