121012220091 has 16 divisors (see below), whose sum is σ = 189383346944. Its totient is φ = 67280925024.

The previous prime is 121012220071. The next prime is 121012220137. The reversal of 121012220091 is 190022210121.

It is not a de Polignac number, because 121012220091 - 2⁵ = 121012220059 is a prime.

It is a super-2 number, since 2×121012220091² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121012220051) 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, 77870665 + ... + 77872218.

It is an arithmetic number, because the mean of its divisors is an integer number (11836459184).

Almost surely, 2^121012220091 is an apocalyptic number.

121012220091 is a deficient number, since it is larger than the sum of its proper divisors (68371126853).

121012220091 is a wasteful number, since it uses less digits than its factorization.

121012220091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155742930.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 121012220091 in words is "one hundred twenty-one billion, twelve million, two hundred twenty thousand, ninety-one".