121113905 has 16 divisors (see below), whose sum is σ = 159624000. Its totient is φ = 87485760.

The previous prime is 121113901. The next prime is 121113973. The reversal of 121113905 is 509311121.

It is not a de Polignac number, because 121113905 - 2² = 121113901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121113901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806 + ... + 15584.

It is an arithmetic number, because the mean of its divisors is an integer number (9976500).

Almost surely, 2^121113905 is an apocalyptic number.

It is an amenable number.

121113905 is a deficient number, since it is larger than the sum of its proper divisors (38510095).

121113905 is a wasteful number, since it uses less digits than its factorization.

121113905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14944.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 121113905 is about 11005.1762820956. The cubic root of 121113905 is about 494.7638978785.

The spelling of 121113905 in words is "one hundred twenty-one million, one hundred thirteen thousand, nine hundred five".