21934999 has 4 divisors (see below), whose sum is σ = 21998200. Its totient is φ = 21871800.

The previous prime is 21934973. The next prime is 21935003. The reversal of 21934999 is 99943912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21934999 - 2¹¹ = 21932951 is a prime.

It is a super-2 number, since 2×21934999² = 962288362260002, 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 (21934399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31077 + ... + 31774.

It is an arithmetic number, because the mean of its divisors is an integer number (5499550).

Almost surely, 2^21934999 is an apocalyptic number.

21934999 is a deficient number, since it is larger than the sum of its proper divisors (63201).

21934999 is an equidigital number, since it uses as much as digits as its factorization.

21934999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63200.

The product of its digits is 157464, while the sum is 46.

The square root of 21934999 is about 4683.4815041804. The cubic root of 21934999 is about 279.9276981685.

The spelling of 21934999 in words is "twenty-one million, nine hundred thirty-four thousand, nine hundred ninety-nine".