21992735 has 8 divisors (see below), whose sum is σ = 26453520. Its totient is φ = 17552704.

The previous prime is 21992723. The next prime is 21992771. The reversal of 21992735 is 53729912.

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

It is a cyclic number.

It is not a de Polignac number, because 21992735 - 2¹⁴ = 21976351 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2750 + ... + 7179.

It is an arithmetic number, because the mean of its divisors is an integer number (3306690).

Almost surely, 2^21992735 is an apocalyptic number.

21992735 is a deficient number, since it is larger than the sum of its proper divisors (4460785).

21992735 is an equidigital number, since it uses as much as digits as its factorization.

21992735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10377.

The product of its digits is 34020, while the sum is 38.

The square root of 21992735 is about 4689.6412442744. The cubic root of 21992735 is about 280.1730860096.

The spelling of 21992735 in words is "twenty-one million, nine hundred ninety-two thousand, seven hundred thirty-five".