21344545724 has 12 divisors (see below), whose sum is σ = 37355896200. Its totient is φ = 10671432528.

The previous prime is 21344545639. The next prime is 21344545741. The reversal of 21344545724 is 42754544312.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151094 + ... + 255965.

It is an arithmetic number, because the mean of its divisors is an integer number (3112991350).

Almost surely, 2^21344545724 is an apocalyptic number.

It is an amenable number.

21344545724 is a deficient number, since it is larger than the sum of its proper divisors (16011350476).

21344545724 is a wasteful number, since it uses less digits than its factorization.

21344545724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420172 (or 420170 counting only the distinct ones).

The product of its digits is 537600, while the sum is 41.

The spelling of 21344545724 in words is "twenty-one billion, three hundred forty-four million, five hundred forty-five thousand, seven hundred twenty-four".