122391905121 has 32 divisors (see below), whose sum is σ = 182102140800. Its totient is φ = 81243993600.

The previous prime is 122391905113. The next prime is 122391905143. The reversal of 122391905121 is 121509193221.

122391905121 is a `hidden beast` number, since 1 + 22 + 39 + 1 + 90 + 512 + 1 = 666.

It is not a de Polignac number, because 122391905121 - 2³ = 122391905113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122391905621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6150630 + ... + 6170496.

It is an arithmetic number, because the mean of its divisors is an integer number (5690691900).

Almost surely, 2^122391905121 is an apocalyptic number.

It is an amenable number.

122391905121 is a deficient number, since it is larger than the sum of its proper divisors (59710235679).

122391905121 is a wasteful number, since it uses less digits than its factorization.

122391905121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20846 (or 20840 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 122391905121 in words is "one hundred twenty-two billion, three hundred ninety-one million, nine hundred five thousand, one hundred twenty-one".