20212022221220 has 24 divisors (see below), whose sum is σ = 42445647122424. Its totient is φ = 8084732610816.

The previous prime is 20212022221219. The next prime is 20212022221271. The reversal of 20212022221220 is 2212222021202.

It can be written as a sum of positive squares in 4 ways, for example, as 1191485768704 + 19020536452516 = 1091552^2 + 4361254^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20212022221192 and 20212022221201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2569817 + ... + 6857696.

It is an arithmetic number, because the mean of its divisors is an integer number (1768568630101).

Almost surely, 2^{20212022221220} is an apocalyptic number.

20212022221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212022221220 is an abundant number, since it is smaller than the sum of its proper divisors (22233624901204).

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

20212022221220 is a wasteful number, since it uses less digits than its factorization.

20212022221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9534719 (or 9534717 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20212022221220 its reverse (2212222021202), we get a palindrome (22424244242422).

The spelling of 20212022221220 in words is "twenty trillion, two hundred twelve billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty".