21611713 has 4 divisors (see below), whose sum is σ = 21633328. Its totient is φ = 21590100.

The previous prime is 21611693. The next prime is 21611731. The reversal of 21611713 is 31711612.

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 a de Polignac number, because none of the positive numbers 2^k-21611713 is a prime.

It is a super-2 number, since 2×21611713² = 934132277588738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21611783) 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, 9231 + ... + 11332.

It is an arithmetic number, because the mean of its divisors is an integer number (5408332).

Almost surely, 2^21611713 is an apocalyptic number.

It is an amenable number.

21611713 is a deficient number, since it is larger than the sum of its proper divisors (21615).

21611713 is a wasteful number, since it uses less digits than its factorization.

21611713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21614.

The product of its digits is 252, while the sum is 22.

The square root of 21611713 is about 4648.8399628294. The cubic root of 21611713 is about 278.5456606703.

The spelling of 21611713 in words is "twenty-one million, six hundred eleven thousand, seven hundred thirteen".