121221209998 has 96 divisors (see below), whose sum is σ = 217306414080. Its totient is φ = 49671532800.

The previous prime is 121221209983. The next prime is 121221209999. The reversal of 121221209998 is 899902122121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221209999) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 447310603 + ... + 447310873.

It is an arithmetic number, because the mean of its divisors is an integer number (2263608480).

Almost surely, 2^121221209998 is an apocalyptic number.

121221209998 is a deficient number, since it is larger than the sum of its proper divisors (96085204082).

121221209998 is a wasteful number, since it uses less digits than its factorization.

121221209998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674 (or 633 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The spelling of 121221209998 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred nine thousand, nine hundred ninety-eight".