101202121991 has 2 divisors, whose sum is σ = 101202121992. Its totient is φ = 101202121990.

The previous prime is 101202121981. The next prime is 101202122027. The reversal of 101202121991 is 199121202101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101202121991 - 2⁶ = 101202121927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101202121961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50601060995 + 50601060996.

It is an arithmetic number, because the mean of its divisors is an integer number (50601060996).

Almost surely, 2^101202121991 is an apocalyptic number.

101202121991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101202121991 is an equidigital number, since it uses as much as digits as its factorization.

101202121991 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 101202121991 in words is "one hundred one billion, two hundred two million, one hundred twenty-one thousand, nine hundred ninety-one".