21474775 has 36 divisors (see below), whose sum is σ = 31620496. Its totient is φ = 14169600.

The previous prime is 21474751. The next prime is 21474781. The reversal of 21474775 is 57747412.

It is not a de Polignac number, because 21474775 - 2⁷ = 21474647 is a prime.

It is a super-2 number, since 2×21474775² = 922331922601250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

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 35 ways as a sum of consecutive naturals, for example, 294139 + ... + 294211.

Almost surely, 2^21474775 is an apocalyptic number.

21474775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21474775 is a deficient number, since it is larger than the sum of its proper divisors (10145721).

21474775 is an equidigital number, since it uses as much as digits as its factorization.

21474775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 126 counting only the distinct ones).

The product of its digits is 54880, while the sum is 37.

The square root of 21474775 is about 4634.0883677375. The cubic root of 21474775 is about 277.9560986866.

The spelling of 21474775 in words is "twenty-one million, four hundred seventy-four thousand, seven hundred seventy-five".