21319124 has 6 divisors (see below), whose sum is σ = 37308474. Its totient is φ = 10659560.

The previous prime is 21319097. The next prime is 21319127. The reversal of 21319124 is 42191312.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 2829124 = 4300^2 + 1682^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21319124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21319127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2664887 + ... + 2664894.

It is an arithmetic number, because the mean of its divisors is an integer number (6218079).

Almost surely, 2^21319124 is an apocalyptic number.

It is an amenable number.

21319124 is a deficient number, since it is larger than the sum of its proper divisors (15989350).

21319124 is a wasteful number, since it uses less digits than its factorization.

21319124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5329785 (or 5329783 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 21319124 is about 4617.2636918417. The cubic root of 21319124 is about 277.2829198048.

The spelling of 21319124 in words is "twenty-one million, three hundred nineteen thousand, one hundred twenty-four".