21710753 has 2 divisors, whose sum is σ = 21710754. Its totient is φ = 21710752.

The previous prime is 21710737. The next prime is 21710783. The reversal of 21710753 is 35701712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21687649 + 23104 = 4657^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 21710753 - 2⁴ = 21710737 is a prime.

It is a super-3 number, since 3×21710753³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21710723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855376 + 10855377.

It is an arithmetic number, because the mean of its divisors is an integer number (10855377).

Almost surely, 2^21710753 is an apocalyptic number.

It is an amenable number.

21710753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21710753 is an equidigital number, since it uses as much as digits as its factorization.

21710753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 21710753 is about 4659.4799065990. The cubic root of 21710753 is about 278.9705094234.

The spelling of 21710753 in words is "twenty-one million, seven hundred ten thousand, seven hundred fifty-three".