120121200091 has 2 divisors, whose sum is σ = 120121200092. Its totient is φ = 120121200090.

The previous prime is 120121200071. The next prime is 120121200107. The reversal of 120121200091 is 190002121021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 120121200091 - 2¹⁹ = 120120675803 is a prime.

It is a super-2 number, since 2×120121200091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (120121200071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60060600045 + 60060600046.

It is an arithmetic number, because the mean of its divisors is an integer number (60060600046).

Almost surely, 2^120121200091 is an apocalyptic number.

120121200091 is a deficient number, since it is larger than the sum of its proper divisors (1).

120121200091 is an equidigital number, since it uses as much as digits as its factorization.

120121200091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 120121200091 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred thousand, ninety-one".