21744364 has 24 divisors (see below), whose sum is σ = 38974320. Its totient is φ = 10612224.

The previous prime is 21744347. The next prime is 21744397. The reversal of 21744364 is 46344712.

It is a super-3 number, since 3×21744364³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32667 + ... + 33325.

It is an arithmetic number, because the mean of its divisors is an integer number (1623930).

Almost surely, 2^21744364 is an apocalyptic number.

It is an amenable number.

21744364 is a deficient number, since it is larger than the sum of its proper divisors (17229956).

21744364 is a wasteful number, since it uses less digits than its factorization.

21744364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 847 counting only the distinct ones).

The product of its digits is 16128, while the sum is 31.

The square root of 21744364 is about 4663.0852447709. The cubic root of 21744364 is about 279.1143957777.

The spelling of 21744364 in words is "twenty-one million, seven hundred forty-four thousand, three hundred sixty-four".