121218001890 has 32 divisors (see below), whose sum is σ = 290932494336. Its totient is φ = 32323768320.

The previous prime is 121218001859. The next prime is 121218001897. The reversal of 121218001890 is 98100812121.

It is not an unprimeable number, because it can be changed into a prime (121218001897) 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, 1567330 + ... + 1642850.

It is an arithmetic number, because the mean of its divisors is an integer number (9091640448).

Almost surely, 2^121218001890 is an apocalyptic number.

121218001890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121218001890 is an abundant number, since it is smaller than the sum of its proper divisors (169714492446).

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

121218001890 is a wasteful number, since it uses less digits than its factorization.

121218001890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129034.

The product of its (nonzero) digits is 2304, while the sum is 33.

The spelling of 121218001890 in words is "one hundred twenty-one billion, two hundred eighteen million, one thousand, eight hundred ninety".