21774625 has 8 divisors (see below), whose sum is σ = 27174888. Its totient is φ = 17419600.

The previous prime is 21774619. The next prime is 21774631. The reversal of 21774625 is 52647712.

It is an interprime number because it is at equal distance from previous prime (21774619) and next prime (21774631).

It can be written as a sum of positive squares in 4 ways, for example, as 678976 + 21095649 = 824^2 + 4593^2 .

It is not a de Polignac number, because 21774625 - 2¹⁹ = 21250337 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86974 + ... + 87223.

It is an arithmetic number, because the mean of its divisors is an integer number (3396861).

Almost surely, 2^21774625 is an apocalyptic number.

21774625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21774625 is a deficient number, since it is larger than the sum of its proper divisors (5400263).

21774625 is an equidigital number, since it uses as much as digits as its factorization.

21774625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174212 (or 174202 counting only the distinct ones).

The product of its digits is 23520, while the sum is 34.

The square root of 21774625 is about 4666.3288568210. The cubic root of 21774625 is about 279.2438142270.

The spelling of 21774625 in words is "twenty-one million, seven hundred seventy-four thousand, six hundred twenty-five".