121021321200020 has 96 divisors (see below), whose sum is σ = 276465515461632. Its totient is φ = 44324569223168.

The previous prime is 121021321199951. The next prime is 121021321200047. The reversal of 121021321200020 is 20002123120121.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20005889 + ... + 25343208.

It is an arithmetic number, because the mean of its divisors is an integer number (2879849119392).

Almost surely, 2^{121021321200020} is an apocalyptic number.

121021321200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021321200020 is an abundant number, since it is smaller than the sum of its proper divisors (155444194261612).

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

121021321200020 is a wasteful number, since it uses less digits than its factorization.

121021321200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45349337 (or 45349335 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 121021321200020 its reverse (20002123120121), we get a palindrome (141023444320141).

The spelling of 121021321200020 in words is "one hundred twenty-one trillion, twenty-one billion, three hundred twenty-one million, two hundred thousand, twenty".