21126975 has 24 divisors (see below), whose sum is σ = 35747712. Its totient is φ = 11004000.

The previous prime is 21126967. The next prime is 21126983. The reversal of 21126975 is 57962112.

It is an interprime number because it is at equal distance from previous prime (21126967) and next prime (21126983).

It is not a de Polignac number, because 21126975 - 2³ = 21126967 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51 + ... + 6500.

It is an arithmetic number, because the mean of its divisors is an integer number (1489488).

Almost surely, 2^21126975 is an apocalyptic number.

21126975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21126975 is a deficient number, since it is larger than the sum of its proper divisors (14620737).

21126975 is a wasteful number, since it uses less digits than its factorization.

21126975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6607 (or 6602 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 21126975 is about 4596.4089243669. The cubic root of 21126975 is about 276.4473552717.

The spelling of 21126975 in words is "twenty-one million, one hundred twenty-six thousand, nine hundred seventy-five".