121262012091 has 32 divisors (see below), whose sum is σ = 200759005440. Its totient is φ = 71699630400.

The previous prime is 121262012083. The next prime is 121262012093. The reversal of 121262012091 is 190210262121.

121262012091 is a `hidden beast` number, since 1 + 2 + 12 + 620 + 1 + 20 + 9 + 1 = 666.

It is not a de Polignac number, because 121262012091 - 2³ = 121262012083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121262012093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4966965 + ... + 4991318.

It is an arithmetic number, because the mean of its divisors is an integer number (6273718920).

Almost surely, 2^121262012091 is an apocalyptic number.

121262012091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121262012091 is a deficient number, since it is larger than the sum of its proper divisors (79496993349).

121262012091 is a wasteful number, since it uses less digits than its factorization.

121262012091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9958344 (or 9958338 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 121262012091 in words is "one hundred twenty-one billion, two hundred sixty-two million, twelve thousand, ninety-one".