21934697 has 4 divisors (see below), whose sum is σ = 21971796. Its totient is φ = 21897600.

The previous prime is 21934691. The next prime is 21934699. The reversal of 21934697 is 79643912.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20830096 + 1104601 = 4564^2 + 1051^2 .

It is a cyclic number.

It is not a de Polignac number, because 21934697 - 2⁴ = 21934681 is a prime.

It is a super-2 number, since 2×21934697² = 962261864963618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21934691) 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, 17648 + ... + 18849.

It is an arithmetic number, because the mean of its divisors is an integer number (5492949).

Almost surely, 2^21934697 is an apocalyptic number.

It is an amenable number.

21934697 is a deficient number, since it is larger than the sum of its proper divisors (37099).

21934697 is an equidigital number, since it uses as much as digits as its factorization.

21934697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37098.

The product of its digits is 81648, while the sum is 41.

The square root of 21934697 is about 4683.4492630966. The cubic root of 21934697 is about 279.9264134856.

The spelling of 21934697 in words is "twenty-one million, nine hundred thirty-four thousand, six hundred ninety-seven".