120001210999991 has 2 divisors, whose sum is σ = 120001210999992. Its totient is φ = 120001210999990.

The previous prime is 120001210999973. The next prime is 120001211000057. The reversal of 120001210999991 is 199999012100021.

It is a weak prime.

It is an emirp because it is prime and its reverse (199999012100021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120001210999991 - 2³⁴ = 119984031130807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120001710999991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60000605499995 + 60000605499996.

It is an arithmetic number, because the mean of its divisors is an integer number (60000605499996).

Almost surely, 2^{120001210999991} is an apocalyptic number.

120001210999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

120001210999991 is an equidigital number, since it uses as much as digits as its factorization.

120001210999991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 53.

The spelling of 120001210999991 in words is "one hundred twenty trillion, one billion, two hundred ten million, nine hundred ninety-nine thousand, nine hundred ninety-one".