121212200020 has 24 divisors (see below), whose sum is σ = 255210246144. Its totient is φ = 48358284576.

The previous prime is 121212200009. The next prime is 121212200023. The reversal of 121212200020 is 20002212121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212200023) 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, 7904364 + ... + 7919683.

It is an arithmetic number, because the mean of its divisors is an integer number (10633760256).

Almost surely, 2^121212200020 is an apocalyptic number.

121212200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212200020 is an abundant number, since it is smaller than the sum of its proper divisors (133998046124).

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

121212200020 is a wasteful number, since it uses less digits than its factorization.

121212200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15824439 (or 15824437 counting only the distinct ones).

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

Adding to 121212200020 its reverse (20002212121), we get a palindrome (141214412141).

The spelling of 121212200020 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred thousand, twenty".