121100091910 has 32 divisors (see below), whose sum is σ = 251919305280. Its totient is φ = 41053512192.

The previous prime is 121100091907. The next prime is 121100091941. The reversal of 121100091910 is 19190001121.

It is a super-2 number, since 2×121100091910² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9712879 + ... + 9725338.

It is an arithmetic number, because the mean of its divisors is an integer number (7872478290).

Almost surely, 2^121100091910 is an apocalyptic number.

121100091910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121100091910 is an abundant number, since it is smaller than the sum of its proper divisors (130819213370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121100091910 is a wasteful number, since it uses less digits than its factorization.

121100091910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19438320.

The product of its (nonzero) digits is 162, while the sum is 25.

The spelling of 121100091910 in words is "one hundred twenty-one billion, one hundred million, ninety-one thousand, nine hundred ten".