121111212220 has 12 divisors (see below), whose sum is σ = 254333545704. Its totient is φ = 48444484880.

The previous prime is 121111212197. The next prime is 121111212281. The reversal of 121111212220 is 22212111121.

It is a junction number, because it is equal to n+sod(n) for n = 121111212194 and 121111212203.

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, 3027780286 + ... + 3027780325.

It is an arithmetic number, because the mean of its divisors is an integer number (21194462142).

Almost surely, 2^121111212220 is an apocalyptic number.

121111212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111212220 is an abundant number, since it is smaller than the sum of its proper divisors (133222333484).

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

121111212220 is a wasteful number, since it uses less digits than its factorization.

121111212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6055560620 (or 6055560618 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121111212220 its reverse (22212111121), we get a palindrome (143323323341).

The spelling of 121111212220 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty".