121221010209998 has 16 divisors (see below), whose sum is σ = 181890009898560. Its totient is φ = 60591007462656.

The previous prime is 121221010209997. The next prime is 121221010210073. The reversal of 121221010209998 is 899902010122121.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221010209997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887614043 + ... + 887750601.

It is an arithmetic number, because the mean of its divisors is an integer number (11368125618660).

Almost surely, 2^{121221010209998} is an apocalyptic number.

121221010209998 is a deficient number, since it is larger than the sum of its proper divisors (60668999688562).

121221010209998 is a wasteful number, since it uses less digits than its factorization.

121221010209998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276091.

The product of its (nonzero) digits is 93312, while the sum is 47.

The spelling of 121221010209998 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, ten million, two hundred nine thousand, nine hundred ninety-eight".