21337969 has 4 divisors (see below), whose sum is σ = 22461040. Its totient is φ = 20214900.

The previous prime is 21337957. The next prime is 21338003. The reversal of 21337969 is 96973312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21337969 - 2⁹ = 21337457 is a prime.

It is a super-2 number, since 2×21337969² = 910617842089922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21337369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561507 + ... + 561544.

It is an arithmetic number, because the mean of its divisors is an integer number (5615260).

Almost surely, 2^21337969 is an apocalyptic number.

It is an amenable number.

21337969 is a deficient number, since it is larger than the sum of its proper divisors (1123071).

21337969 is a wasteful number, since it uses less digits than its factorization.

21337969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123070.

The product of its digits is 61236, while the sum is 40.

The square root of 21337969 is about 4619.3039518958. The cubic root of 21337969 is about 277.3645969838.

The spelling of 21337969 in words is "twenty-one million, three hundred thirty-seven thousand, nine hundred sixty-nine".