121121999999 has 96 divisors (see below), whose sum is σ = 173862775296. Its totient is φ = 82784782080.

The previous prime is 121121999951. The next prime is 121122000007. The reversal of 121121999999 is 999999121121.

It is a de Polignac number, because none of the positive numbers 2^k-121121999999 is a prime.

121121999999 is a modest number, since divided by 999999 gives 121121 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121999699) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25299884 + ... + 25304670.

It is an arithmetic number, because the mean of its divisors is an integer number (1811070576).

Almost surely, 2^121121999999 is an apocalyptic number.

121121999999 is a deficient number, since it is larger than the sum of its proper divisors (52740775297).

121121999999 is a wasteful number, since it uses less digits than its factorization.

121121999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5005 (or 4998 counting only the distinct ones).

The product of its digits is 2125764, while the sum is 62.

The spelling of 121121999999 in words is "one hundred twenty-one billion, one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".