121112010991 has 8 divisors (see below), whose sum is σ = 123285686400. Its totient is φ = 118942366680.

The previous prime is 121112010979. The next prime is 121112011043. The reversal of 121112010991 is 199010211121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121112010991 - 2¹⁷ = 121111879919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112010791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947115 + ... + 1067356.

It is an arithmetic number, because the mean of its divisors is an integer number (15410710800).

Almost surely, 2^121112010991 is an apocalyptic number.

121112010991 is a deficient number, since it is larger than the sum of its proper divisors (2173675409).

121112010991 is a wasteful number, since it uses less digits than its factorization.

121112010991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015549.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 121112010991 in words is "one hundred twenty-one billion, one hundred twelve million, ten thousand, nine hundred ninety-one".