9916261021 has 2 divisors, whose sum is σ = 9916261022. Its totient is φ = 9916261020.

The previous prime is 9916261001. The next prime is 9916261031. The reversal of 9916261021 is 1201626199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5070152025 + 4846108996 = 71205^2 + 69614^2 .

It is a cyclic number.

It is not a de Polignac number, because 9916261021 - 2³³ = 1326326429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9916261001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4958130510 + 4958130511.

It is an arithmetic number, because the mean of its divisors is an integer number (4958130511).

Almost surely, 2^9916261021 is an apocalyptic number.

It is an amenable number.

9916261021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9916261021 is an equidigital number, since it uses as much as digits as its factorization.

9916261021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 9916261021 is about 99580.4248886296. The cubic root of 9916261021 is about 2148.4041535014.

The spelling of 9916261021 in words is "nine billion, nine hundred sixteen million, two hundred sixty-one thousand, twenty-one".