2121222020 has 12 divisors (see below), whose sum is σ = 4454566284. Its totient is φ = 848488800.

The previous prime is 2121222017. The next prime is 2121222031. The reversal of 2121222020 is 202221212.

It can be written as a sum of positive squares in 2 ways, for example, as 1063151236 + 1058070784 = 32606^2 + 32528^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2121221986 and 2121222004.

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, 53030531 + ... + 53030570.

It is an arithmetic number, because the mean of its divisors is an integer number (371213857).

Almost surely, 2^2121222020 is an apocalyptic number.

2121222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121222020 is an abundant number, since it is smaller than the sum of its proper divisors (2333344264).

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

2121222020 is a wasteful number, since it uses less digits than its factorization.

2121222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106061110 (or 106061108 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2121222020 is about 46056.7261103088. The cubic root of 2121222020 is about 1284.8784413669.

Adding to 2121222020 its reverse (202221212), we get a palindrome (2323443232).

The spelling of 2121222020 in words is "two billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty".