21677125 has 24 divisors (see below), whose sum is σ = 28930824. Its totient is φ = 16160000.

The previous prime is 21677093. The next prime is 21677137. The reversal of 21677125 is 52177612.

It can be written as a sum of positive squares in 12 ways, for example, as 1481089 + 20196036 = 1217^2 + 4494^2 .

It is not a de Polignac number, because 21677125 - 2⁵ = 21677093 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 214575 + ... + 214675.

It is an arithmetic number, because the mean of its divisors is an integer number (1205451).

Almost surely, 2^21677125 is an apocalyptic number.

21677125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21677125 is a deficient number, since it is larger than the sum of its proper divisors (7253699).

21677125 is an equidigital number, since it uses as much as digits as its factorization.

21677125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 123 counting only the distinct ones).

The product of its digits is 5880, while the sum is 31.

The square root of 21677125 is about 4655.8699509329. The cubic root of 21677125 is about 278.8264016010.

The spelling of 21677125 in words is "twenty-one million, six hundred seventy-seven thousand, one hundred twenty-five".