21022675 has 6 divisors (see below), whose sum is σ = 26068148. Its totient is φ = 16818120.

The previous prime is 21022669. The next prime is 21022699. The reversal of 21022675 is 57622012.

It is not a de Polignac number, because 21022675 - 2⁹ = 21022163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 840907 = 21022675 / (2 + 1 + 0 + 2 + 2 + 6 + 7 + 5).

It is a Duffinian 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, 420429 + ... + 420478.

Almost surely, 2^21022675 is an apocalyptic number.

21022675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21022675 is a deficient number, since it is larger than the sum of its proper divisors (5045473).

21022675 is an equidigital number, since it uses as much as digits as its factorization.

21022675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840917 (or 840912 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 21022675 is about 4585.0490728017. The cubic root of 21022675 is about 275.9916812938.

Adding to 21022675 its reverse (57622012), we get a palindrome (78644687).

The spelling of 21022675 in words is "twenty-one million, twenty-two thousand, six hundred seventy-five".