121212202220020 has 24 divisors (see below), whose sum is σ = 254547966040200. Its totient is φ = 48484434911232.

The previous prime is 121212202219963. The next prime is 121212202220033. The reversal of 121212202220020 is 20022202212121.

It can be written as a sum of positive squares in 4 ways, for example, as 2376302408676 + 118835899811344 = 1541526^2 + 10901188^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121212202220020.

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, 25640505 + ... + 29997664.

It is an arithmetic number, because the mean of its divisors is an integer number (10606165251675).

Almost surely, 2^{121212202220020} is an apocalyptic number.

121212202220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212202220020 is an abundant number, since it is smaller than the sum of its proper divisors (133335763820180).

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

121212202220020 is a wasteful number, since it uses less digits than its factorization.

121212202220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55747107 (or 55747105 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 121212202220020 its reverse (20022202212121), we get a palindrome (141234404432141).

The spelling of 121212202220020 in words is "one hundred twenty-one trillion, two hundred twelve billion, two hundred two million, two hundred twenty thousand, twenty".