121002199998 has 64 divisors (see below), whose sum is σ = 260065728000. Its totient is φ = 37419822720.

The previous prime is 121002199987. The next prime is 121002199999. The reversal of 121002199998 is 899991200121.

It is a self number, because there is not a number n which added to its sum of digits gives 121002199998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002199999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1155840 + ... + 1256172.

It is an arithmetic number, because the mean of its divisors is an integer number (4063527000).

Almost surely, 2^121002199998 is an apocalyptic number.

121002199998 is an abundant number, since it is smaller than the sum of its proper divisors (139063528002).

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

121002199998 is a wasteful number, since it uses less digits than its factorization.

121002199998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100577.

The product of its (nonzero) digits is 209952, while the sum is 51.

The spelling of 121002199998 in words is "one hundred twenty-one billion, two million, one hundred ninety-nine thousand, nine hundred ninety-eight".