21346925 has 12 divisors (see below), whose sum is σ = 26664960. Its totient is φ = 16951920.

The previous prime is 21346907. The next prime is 21346939. The reversal of 21346925 is 52964312.

It is a happy number.

It is not a de Polignac number, because 21346925 - 2¹⁰ = 21345901 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21346891 and 21346900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (2222080).

Almost surely, 2^21346925 is an apocalyptic number.

21346925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21346925 is a deficient number, since it is larger than the sum of its proper divisors (5318035).

21346925 is a wasteful number, since it uses less digits than its factorization.

21346925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6292 (or 6287 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 21346925 is about 4620.2732603170. The cubic root of 21346925 is about 277.4033968319.

The spelling of 21346925 in words is "twenty-one million, three hundred forty-six thousand, nine hundred twenty-five".