121211212012220 has 96 divisors (see below), whose sum is σ = 283352018939136. Its totient is φ = 43545757738560.

The previous prime is 121211212012183. The next prime is 121211212012273. The reversal of 121211212012220 is 22210212112121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121211212012192 and 121211212012201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25220594 + ... + 29639513.

It is an arithmetic number, because the mean of its divisors is an integer number (2951583530616).

Almost surely, 2^{121211212012220} is an apocalyptic number.

121211212012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211212012220 is an abundant number, since it is smaller than the sum of its proper divisors (162140806926916).

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

121211212012220 is a wasteful number, since it uses less digits than its factorization.

121211212012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54860232 (or 54860208 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121211212012220 its reverse (22210212112121), we get a palindrome (143421424124341).

Subtracting from 121211212012220 its reverse (22210212112121), we obtain a palindrome (99000999900099).

The spelling of 121211212012220 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred twelve million, twelve thousand, two hundred twenty".