121212100220 has 12 divisors (see below), whose sum is σ = 254545410504. Its totient is φ = 48484840080.

The previous prime is 121212100201. The next prime is 121212100259. The reversal of 121212100220 is 22001212121.

It is a junction number, because it is equal to n+sod(n) for n = 121212100195 and 121212100204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030302486 + ... + 3030302525.

It is an arithmetic number, because the mean of its divisors is an integer number (21212117542).

Almost surely, 2^121212100220 is an apocalyptic number.

121212100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212100220 is an abundant number, since it is smaller than the sum of its proper divisors (133333310284).

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

121212100220 is a wasteful number, since it uses less digits than its factorization.

121212100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6060605020 (or 6060605018 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121212100220 its reverse (22001212121), we get a palindrome (143213312341).

The spelling of 121212100220 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred thousand, two hundred twenty".