101121319991 has 2 divisors, whose sum is σ = 101121319992. Its totient is φ = 101121319990.

The previous prime is 101121319951. The next prime is 101121320057. The reversal of 101121319991 is 199913121101.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (199913121101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101121319991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101121319951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50560659995 + 50560659996.

It is an arithmetic number, because the mean of its divisors is an integer number (50560659996).

Almost surely, 2^101121319991 is an apocalyptic number.

101121319991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101121319991 is an equidigital number, since it uses as much as digits as its factorization.

101121319991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 38.

The spelling of 101121319991 in words is "one hundred one billion, one hundred twenty-one million, three hundred nineteen thousand, nine hundred ninety-one".