121121222020 has 24 divisors (see below), whose sum is σ = 256872932568. Its totient is φ = 47968800000.

The previous prime is 121121222009. The next prime is 121121222041. The reversal of 121121222020 is 20222121121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 46448008324 + 74673213696 = 215518^2 + 273264^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121121221985 and 121121222003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29978481 + ... + 29982520.

It is an arithmetic number, because the mean of its divisors is an integer number (10703038857).

Almost surely, 2^121121222020 is an apocalyptic number.

121121222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121222020 is an abundant number, since it is smaller than the sum of its proper divisors (135751710548).

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

121121222020 is a wasteful number, since it uses less digits than its factorization.

121121222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59961111 (or 59961109 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121121222020 its reverse (20222121121), we get a palindrome (141343343141).

The spelling of 121121222020 in words is "one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty".