21611301713 has 2 divisors, whose sum is σ = 21611301714. Its totient is φ = 21611301712.

The previous prime is 21611301637. The next prime is 21611301763. The reversal of 21611301713 is 31710311612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16416784384 + 5194517329 = 128128^2 + 72073^2 .

It is a cyclic number.

It is not a de Polignac number, because 21611301713 - 2⁸ = 21611301457 is a prime.

It is not a weakly prime, because it can be changed into another prime (21611301763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805650856 + 10805650857.

It is an arithmetic number, because the mean of its divisors is an integer number (10805650857).

Almost surely, 2^21611301713 is an apocalyptic number.

It is an amenable number.

21611301713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21611301713 is an equidigital number, since it uses as much as digits as its factorization.

21611301713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The spelling of 21611301713 in words is "twenty-one billion, six hundred eleven million, three hundred one thousand, seven hundred thirteen".