21610753 has 2 divisors, whose sum is σ = 21610754. Its totient is φ = 21610752.

The previous prime is 21610691. The next prime is 21610759. The reversal of 21610753 is 35701612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15499969 + 6110784 = 3937^2 + 2472^2 .

It is a cyclic number.

It is not a de Polignac number, because 21610753 - 2⁹ = 21610241 is a prime.

It is a super-3 number, since 3×21610753³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21610759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805376 + 10805377.

It is an arithmetic number, because the mean of its divisors is an integer number (10805377).

Almost surely, 2^21610753 is an apocalyptic number.

It is an amenable number.

21610753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21610753 is an equidigital number, since it uses as much as digits as its factorization.

21610753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21610753 is about 4648.7367101181. The cubic root of 21610753 is about 278.5415362434.

The spelling of 21610753 in words is "twenty-one million, six hundred ten thousand, seven hundred fifty-three".