21610512975739 has 2 divisors, whose sum is σ = 21610512975740. Its totient is φ = 21610512975738.

The previous prime is 21610512975647. The next prime is 21610512975743. The reversal of 21610512975739 is 93757921501612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21610512975739 - 2²³ = 21610504587131 is a prime.

It is a super-2 number, since 2×21610512975739² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21610512955739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805256487869 + 10805256487870.

It is an arithmetic number, because the mean of its divisors is an integer number (10805256487870).

Almost surely, 2^{21610512975739} is an apocalyptic number.

21610512975739 is a deficient number, since it is larger than the sum of its proper divisors (1).

21610512975739 is an equidigital number, since it uses as much as digits as its factorization.

21610512975739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7144200, while the sum is 58.

The spelling of 21610512975739 in words is "twenty-one trillion, six hundred ten billion, five hundred twelve million, nine hundred seventy-five thousand, seven hundred thirty-nine".