20112330991 has 2 divisors, whose sum is σ = 20112330992. Its totient is φ = 20112330990.

The previous prime is 20112330949. The next prime is 20112331009. The reversal of 20112330991 is 19903321102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20112330991 - 2³¹ = 17964847343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112330911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056165495 + 10056165496.

It is an arithmetic number, because the mean of its divisors is an integer number (10056165496).

Almost surely, 2^20112330991 is an apocalyptic number.

20112330991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112330991 is an equidigital number, since it uses as much as digits as its factorization.

20112330991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 31.

The spelling of 20112330991 in words is "twenty billion, one hundred twelve million, three hundred thirty thousand, nine hundred ninety-one".