21294825 has 24 divisors (see below), whose sum is σ = 35340000. Its totient is φ = 11314560.

The previous prime is 21294821. The next prime is 21294827. The reversal of 21294825 is 52849212.

It is not a de Polignac number, because 21294825 - 2² = 21294821 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21294821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37141 + ... + 37709.

It is an arithmetic number, because the mean of its divisors is an integer number (1472500).

Almost surely, 2^21294825 is an apocalyptic number.

21294825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21294825 is a deficient number, since it is larger than the sum of its proper divisors (14045175).

21294825 is a wasteful number, since it uses less digits than its factorization.

21294825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081 (or 1076 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 21294825 is about 4614.6316212673. The cubic root of 21294825 is about 277.1775330621.

The spelling of 21294825 in words is "twenty-one million, two hundred ninety-four thousand, eight hundred twenty-five".