21369733 has 24 divisors (see below), whose sum is σ = 27808704. Its totient is φ = 16228800.

The previous prime is 21369713. The next prime is 21369739. The reversal of 21369733 is 33796312.

It is not a de Polignac number, because 21369733 - 2²¹ = 19272581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21369739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21616 + ... + 22582.

It is an arithmetic number, because the mean of its divisors is an integer number (1158696).

Almost surely, 2^21369733 is an apocalyptic number.

It is an amenable number.

21369733 is a deficient number, since it is larger than the sum of its proper divisors (6438971).

21369733 is a wasteful number, since it uses less digits than its factorization.

21369733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1026 counting only the distinct ones).

The product of its digits is 20412, while the sum is 34.

The square root of 21369733 is about 4622.7408536495. The cubic root of 21369733 is about 277.5021583578.

The spelling of 21369733 in words is "twenty-one million, three hundred sixty-nine thousand, seven hundred thirty-three".