21935722 has 8 divisors (see below), whose sum is σ = 33443172. Its totient is φ = 10788000.

The previous prime is 21935717. The next prime is 21935723. The reversal of 21935722 is 22753912.

It can be written as a sum of positive squares in 2 ways, for example, as 21799561 + 136161 = 4669^2 + 369^2 .

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

It is a super-2 number, since 2×21935722² = 962351799322568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21935723) 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, 89779 + ... + 90022.

Almost surely, 2^21935722 is an apocalyptic number.

21935722 is a deficient number, since it is larger than the sum of its proper divisors (11507450).

21935722 is a wasteful number, since it uses less digits than its factorization.

21935722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179864.

The product of its digits is 7560, while the sum is 31.

The square root of 21935722 is about 4683.5586897145. The cubic root of 21935722 is about 279.9307737025.

The spelling of 21935722 in words is "twenty-one million, nine hundred thirty-five thousand, seven hundred twenty-two".