21490675 has 12 divisors (see below), whose sum is σ = 26717040. Its totient is φ = 17148320.

The previous prime is 21490663. The next prime is 21490687. The reversal of 21490675 is 57609412.

It is an interprime number because it is at equal distance from previous prime (21490663) and next prime (21490687).

It is not a de Polignac number, because 21490675 - 2⁵ = 21490643 is a prime.

It is a super-2 number, since 2×21490675² = 923698223911250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21490675.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11721 + ... + 13429.

It is an arithmetic number, because the mean of its divisors is an integer number (2226420).

Almost surely, 2^21490675 is an apocalyptic number.

21490675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21490675 is a deficient number, since it is larger than the sum of its proper divisors (5226365).

21490675 is a wasteful number, since it uses less digits than its factorization.

21490675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222 (or 2217 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21490675 is about 4635.8035980831. The cubic root of 21490675 is about 278.0246816587.

The spelling of 21490675 in words is "twenty-one million, four hundred ninety thousand, six hundred seventy-five".