121240991979 has 96 divisors (see below), whose sum is σ = 196215219200. Its totient is φ = 71837176320.

The previous prime is 121240991959. The next prime is 121240991999. The reversal of 121240991979 is 979199042121.

121240991979 is a `hidden beast` number, since 1 + 212 + 409 + 9 + 19 + 7 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (121240991959) and next prime (121240991999).

It is not a de Polignac number, because 121240991979 - 2⁵ = 121240991947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121240991929) 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, 21489999 + ... + 21495639.

Almost surely, 2^121240991979 is an apocalyptic number.

121240991979 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121240991979 is a deficient number, since it is larger than the sum of its proper divisors (74974227221).

121240991979 is a wasteful number, since it uses less digits than its factorization.

121240991979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5825 (or 5822 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The spelling of 121240991979 in words is "one hundred twenty-one billion, two hundred forty million, nine hundred ninety-one thousand, nine hundred seventy-nine".