121020100020020 has 24 divisors (see below), whose sum is σ = 254168472948264. Its totient is φ = 48403037549696.

The previous prime is 121020100019953. The next prime is 121020100020073. The reversal of 121020100020020 is 20020001020121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 43263716730256 + 77756383289764 = 6577516^2 + 8817958^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121020100019983 and 121020100020010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312455267 + ... + 312842346.

It is an arithmetic number, because the mean of its divisors is an integer number (10590353039511).

Almost surely, 2^{121020100020020} is an apocalyptic number.

121020100020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121020100020020 is an abundant number, since it is smaller than the sum of its proper divisors (133148372928244).

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

121020100020020 is a wasteful number, since it uses less digits than its factorization.

121020100020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625307299 (or 625307297 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121020100020020 its reverse (20020001020121), we get a palindrome (141040101040141).

The spelling of 121020100020020 in words is "one hundred twenty-one trillion, twenty billion, one hundred million, twenty thousand, twenty".