121010100020020 has 48 divisors (see below), whose sum is σ = 259006454754768. Its totient is φ = 47474155688960.

The previous prime is 121010100019973. The next prime is 121010100020063. The reversal of 121010100020020 is 20020001010121.

It can be written as a sum of positive squares in 8 ways, for example, as 1161993449764 + 119848106570256 = 1077958^2 + 10947516^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 121010100019979 and 121010100020006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16918489 + ... + 22983808.

It is an arithmetic number, because the mean of its divisors is an integer number (5395967807391).

Almost surely, 2^{121010100020020} is an apocalyptic number.

121010100020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121010100020020 is an abundant number, since it is smaller than the sum of its proper divisors (137996354734748).

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

121010100020020 is a wasteful number, since it uses less digits than its factorization.

121010100020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39905220 (or 39905218 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121010100020020 its reverse (20020001010121), we get a palindrome (141030101030141).

The spelling of 121010100020020 in words is "one hundred twenty-one trillion, ten billion, one hundred million, twenty thousand, twenty".