21600749 has 8 divisors (see below), whose sum is σ = 23065152. Its totient is φ = 20180160.

The previous prime is 21600743. The next prime is 21600757. The reversal of 21600749 is 94700612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21600749 is a prime.

It is a super-2 number, since 2×21600749² = 933184714722002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9932 + ... + 11909.

It is an arithmetic number, because the mean of its divisors is an integer number (2883144).

Almost surely, 2^21600749 is an apocalyptic number.

It is an amenable number.

21600749 is a deficient number, since it is larger than the sum of its proper divisors (1464403).

21600749 is a wasteful number, since it uses less digits than its factorization.

21600749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21907.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21600749 is about 4647.6605943205. The cubic root of 21600749 is about 278.4985490074.

The spelling of 21600749 in words is "twenty-one million, six hundred thousand, seven hundred forty-nine".