121900791498 has 32 divisors (see below), whose sum is σ = 258161722560. Its totient is φ = 38240590080.

The previous prime is 121900791487. The next prime is 121900791503. The reversal of 121900791498 is 894197009121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 121900791498.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1696873 + ... + 1767251.

It is an arithmetic number, because the mean of its divisors is an integer number (8067553830).

Almost surely, 2^121900791498 is an apocalyptic number.

121900791498 is an abundant number, since it is smaller than the sum of its proper divisors (136260931062).

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

121900791498 is a wasteful number, since it uses less digits than its factorization.

121900791498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87382.

The product of its (nonzero) digits is 326592, while the sum is 51.

The spelling of 121900791498 in words is "one hundred twenty-one billion, nine hundred million, seven hundred ninety-one thousand, four hundred ninety-eight".