122100211131991 has 2 divisors, whose sum is σ = 122100211131992. Its totient is φ = 122100211131990.

The previous prime is 122100211131973. The next prime is 122100211132033. The reversal of 122100211131991 is 199131112001221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122100211131991 - 2¹¹ = 122100211129943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122100211131491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61050105565995 + 61050105565996.

It is an arithmetic number, because the mean of its divisors is an integer number (61050105565996).

Almost surely, 2^{122100211131991} is an apocalyptic number.

122100211131991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122100211131991 is an equidigital number, since it uses as much as digits as its factorization.

122100211131991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 34.

The spelling of 122100211131991 in words is "one hundred twenty-two trillion, one hundred billion, two hundred eleven million, one hundred thirty-one thousand, nine hundred ninety-one".