21465124 has 12 divisors (see below), whose sum is σ = 37705500. Its totient is φ = 10692128.

The previous prime is 21465121. The next prime is 21465131. The reversal of 21465124 is 42156412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1822500 + 19642624 = 1350^2 + 4432^2 .

It is not an unprimeable number, because it can be changed into a prime (21465121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8899 + ... + 11050.

It is an arithmetic number, because the mean of its divisors is an integer number (3142125).

Almost surely, 2^21465124 is an apocalyptic number.

It is an amenable number.

21465124 is a deficient number, since it is larger than the sum of its proper divisors (16240376).

21465124 is a wasteful number, since it uses less digits than its factorization.

21465124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20222 (or 20220 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 21465124 is about 4633.0469455856. The cubic root of 21465124 is about 277.9144536051.

The spelling of 21465124 in words is "twenty-one million, four hundred sixty-five thousand, one hundred twenty-four".