121131122020 has 48 divisors (see below), whose sum is σ = 256410862848. Its totient is φ = 48065897600.

The previous prime is 121131121981. The next prime is 121131122053. The reversal of 121131122020 is 20221131121.

It is a junction number, because it is equal to n+sod(n) for n = 121131121985 and 121131122003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1643970 + ... + 1716070.

It is an arithmetic number, because the mean of its divisors is an integer number (5341892976).

Almost surely, 2^121131122020 is an apocalyptic number.

121131122020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121131122020 is an abundant number, since it is smaller than the sum of its proper divisors (135279740828).

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

121131122020 is a wasteful number, since it uses less digits than its factorization.

121131122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72780 (or 72778 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121131122020 its reverse (20221131121), we get a palindrome (141352253141).

The spelling of 121131122020 in words is "one hundred twenty-one billion, one hundred thirty-one million, one hundred twenty-two thousand, twenty".