11910161621 has 2 divisors, whose sum is σ = 11910161622. Its totient is φ = 11910161620.

The previous prime is 11910161479. The next prime is 11910161623. The reversal of 11910161621 is 12616101911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11857032100 + 53129521 = 108890^2 + 7289^2 .

It is a cyclic number.

It is not a de Polignac number, because 11910161621 - 2¹⁴ = 11910145237 is a prime.

It is a Sophie Germain prime.

Together with 11910161623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11910161623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5955080810 + 5955080811.

It is an arithmetic number, because the mean of its divisors is an integer number (5955080811).

Almost surely, 2^11910161621 is an apocalyptic number.

It is an amenable number.

11910161621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11910161621 is an equidigital number, since it uses as much as digits as its factorization.

11910161621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 11910161621 in words is "eleven billion, nine hundred ten million, one hundred sixty-one thousand, six hundred twenty-one".