121020200020 has 24 divisors (see below), whose sum is σ = 262340563968. Its totient is φ = 46846528800.

The previous prime is 121020199997. The next prime is 121020200023. The reversal of 121020200020 is 20002020121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020200023) 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 7 ways as a sum of consecutive naturals, for example, 97596316 + ... + 97597555.

It is an arithmetic number, because the mean of its divisors is an integer number (10930856832).

Almost surely, 2^121020200020 is an apocalyptic number.

121020200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121020200020 is an abundant number, since it is smaller than the sum of its proper divisors (141320363948).

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

121020200020 is a wasteful number, since it uses less digits than its factorization.

121020200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195193911 (or 195193909 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 121020200020 its reverse (20002020121), we get a palindrome (141022220141).

The spelling of 121020200020 in words is "one hundred twenty-one billion, twenty million, two hundred thousand, twenty".