21764113 has 4 divisors (see below), whose sum is σ = 24873280. Its totient is φ = 18654948.

The previous prime is 21764111. The next prime is 21764137. The reversal of 21764113 is 31146712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21764113 - 2¹ = 21764111 is a prime.

It is a super-2 number, since 2×21764113² = 947353229353538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21764111) 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, 1554573 + ... + 1554586.

It is an arithmetic number, because the mean of its divisors is an integer number (6218320).

Almost surely, 2^21764113 is an apocalyptic number.

It is an amenable number.

21764113 is a deficient number, since it is larger than the sum of its proper divisors (3109167).

21764113 is an equidigital number, since it uses as much as digits as its factorization.

21764113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109166.

The product of its digits is 1008, while the sum is 25.

The square root of 21764113 is about 4665.2023535963. The cubic root of 21764113 is about 279.1988707286.

The spelling of 21764113 in words is "twenty-one million, seven hundred sixty-four thousand, one hundred thirteen".