21124926 has 24 divisors (see below), whose sum is σ = 46136064. Its totient is φ = 6985440.

The previous prime is 21124877. The next prime is 21124927. The reversal of 21124926 is 62942112.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21124926.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2335 + ... + 6906.

It is an arithmetic number, because the mean of its divisors is an integer number (1922336).

Almost surely, 2^21124926 is an apocalyptic number.

21124926 is an abundant number, since it is smaller than the sum of its proper divisors (25011138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21124926 is a wasteful number, since it uses less digits than its factorization.

21124926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9376 (or 9373 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21124926 is about 4596.1860275668. The cubic root of 21124926 is about 276.4384178991.

The spelling of 21124926 in words is "twenty-one million, one hundred twenty-four thousand, nine hundred twenty-six".