20320111220951 has 2 divisors, whose sum is σ = 20320111220952. Its totient is φ = 20320111220950.

The previous prime is 20320111220947. The next prime is 20320111221013. The reversal of 20320111220951 is 15902211102302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20320111220951 - 2² = 20320111220947 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320114220951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160055610475 + 10160055610476.

It is an arithmetic number, because the mean of its divisors is an integer number (10160055610476).

Almost surely, 2^{20320111220951} is an apocalyptic number.

20320111220951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320111220951 is an equidigital number, since it uses as much as digits as its factorization.

20320111220951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 20320111220951 in words is "twenty trillion, three hundred twenty billion, one hundred eleven million, two hundred twenty thousand, nine hundred fifty-one".