121100202020020 has 24 divisors (see below), whose sum is σ = 254414778232104. Its totient is φ = 48420203857536.

The previous prime is 121100202019967. The next prime is 121100202020027. The reversal of 121100202020020 is 20020202001121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17720681644836 + 103379520375184 = 4209594^2 + 10167572^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100202020027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1242259447 + ... + 1242356926.

It is an arithmetic number, because the mean of its divisors is an integer number (10600615759671).

Almost surely, 2^{121100202020020} is an apocalyptic number.

121100202020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121100202020020 is an abundant number, since it is smaller than the sum of its proper divisors (133314576212084).

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

121100202020020 is a wasteful number, since it uses less digits than its factorization.

121100202020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484618819 (or 2484618817 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121100202020020 its reverse (20020202001121), we get a palindrome (141120404021141).

The spelling of 121100202020020 in words is "one hundred twenty-one trillion, one hundred billion, two hundred two million, twenty thousand, twenty".