21973699 has 8 divisors (see below), whose sum is σ = 24744960. Its totient is φ = 19331400.

The previous prime is 21973697. The next prime is 21973729. The reversal of 21973699 is 99637912.

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

It is not a de Polignac number, because 21973699 - 2¹ = 21973697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21973691) 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 7 ways as a sum of consecutive naturals, for example, 31879 + ... + 32560.

It is an arithmetic number, because the mean of its divisors is an integer number (3093120).

Almost surely, 2^21973699 is an apocalyptic number.

21973699 is a deficient number, since it is larger than the sum of its proper divisors (2771261).

21973699 is a wasteful number, since it uses less digits than its factorization.

21973699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64481.

The product of its digits is 183708, while the sum is 46.

The square root of 21973699 is about 4687.6112253471. The cubic root of 21973699 is about 280.0922272716.

The spelling of 21973699 in words is "twenty-one million, nine hundred seventy-three thousand, six hundred ninety-nine".