21146924 has 24 divisors (see below), whose sum is σ = 39513600. Its totient is φ = 9873360.

The previous prime is 21146921. The next prime is 21146953. The reversal of 21146924 is 42964112.

It is not an unprimeable number, because it can be changed into a prime (21146921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3437 + ... + 7355.

It is an arithmetic number, because the mean of its divisors is an integer number (1646400).

Almost surely, 2^21146924 is an apocalyptic number.

It is an amenable number.

21146924 is a deficient number, since it is larger than the sum of its proper divisors (18366676).

21146924 is a wasteful number, since it uses less digits than its factorization.

21146924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013 (or 4011 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21146924 is about 4598.5784760076. The cubic root of 21146924 is about 276.5343390671.

The spelling of 21146924 in words is "twenty-one million, one hundred forty-six thousand, nine hundred twenty-four".