121646997018 has 192 divisors, whose sum is σ = 286925463552. Its totient is φ = 38582879040.

The previous prime is 121646997011. The next prime is 121646997023. The reversal of 121646997018 is 810799646121.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121646997011) 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, 429847905 + ... + 429848187.

It is an arithmetic number, because the mean of its divisors is an integer number (1494403456).

Almost surely, 2^121646997018 is an apocalyptic number.

121646997018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121646997018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143462731776).

121646997018 is an abundant number, since it is smaller than the sum of its proper divisors (165278466534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121646997018 is a wasteful number, since it uses less digits than its factorization.

121646997018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 121646997018 in words is "one hundred twenty-one billion, six hundred forty-six million, nine hundred ninety-seven thousand, eighteen".