121111122122220 has 96 divisors (see below), whose sum is σ = 363694174260480. Its totient is φ = 30019201655040.

The previous prime is 121111122122149. The next prime is 121111122122231. The reversal of 121111122122220 is 22221221111121.

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, 1002183226 + ... + 1002304065.

It is an arithmetic number, because the mean of its divisors is an integer number (3788480981880).

Almost surely, 2^{121111122122220} is an apocalyptic number.

121111122122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121111122122220 is an abundant number, since it is smaller than the sum of its proper divisors (242583052138260).

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

121111122122220 is a wasteful number, since it uses less digits than its factorization.

121111122122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2004487375 (or 2004487373 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 121111122122220 its reverse (22221221111121), we get a palindrome (143332343233341).

The spelling of 121111122122220 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty".