21274125 has 16 divisors (see below), whose sum is σ = 35400768. Its totient is φ = 11346000.

The previous prime is 21274109. The next prime is 21274133. The reversal of 21274125 is 52147212.

It is not a de Polignac number, because 21274125 - 2⁴ = 21274109 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21274095 and 21274104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27991 + ... + 28740.

It is an arithmetic number, because the mean of its divisors is an integer number (2212548).

Almost surely, 2^21274125 is an apocalyptic number.

21274125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21274125 is a deficient number, since it is larger than the sum of its proper divisors (14126643).

21274125 is an equidigital number, since it uses as much as digits as its factorization.

21274125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56749 (or 56739 counting only the distinct ones).

The product of its digits is 1120, while the sum is 24.

The square root of 21274125 is about 4612.3882100274. The cubic root of 21274125 is about 277.0876922198.

The spelling of 21274125 in words is "twenty-one million, two hundred seventy-four thousand, one hundred twenty-five".