21751713 has 32 divisors (see below), whose sum is σ = 34320000. Its totient is φ = 13576896.

The previous prime is 21751703. The next prime is 21751729. The reversal of 21751713 is 31715712.

It is a happy number.

It is not a de Polignac number, because 21751713 - 2⁶ = 21751649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21751703) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55723 + ... + 56111.

It is an arithmetic number, because the mean of its divisors is an integer number (1072500).

Almost surely, 2^21751713 is an apocalyptic number.

It is an amenable number.

21751713 is a deficient number, since it is larger than the sum of its proper divisors (12568287).

21751713 is a wasteful number, since it uses less digits than its factorization.

21751713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 520 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 21751713 is about 4663.8731758057. The cubic root of 21751713 is about 279.1458365785.

The spelling of 21751713 in words is "twenty-one million, seven hundred fifty-one thousand, seven hundred thirteen".