22222021221220 has 24 divisors (see below), whose sum is σ = 46679364265464. Its totient is φ = 8886309497856.

The previous prime is 22222021221173. The next prime is 22222021221269. The reversal of 22222021221220 is 2212212022222.

It can be written as a sum of positive squares in 4 ways, for example, as 4920198295104 + 17301822926116 = 2218152^2 + 4159546^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22222021221191 and 22222021221200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156113997 + ... + 156256276.

It is an arithmetic number, because the mean of its divisors is an integer number (1944973511061).

Almost surely, 2^{22222021221220} is an apocalyptic number.

22222021221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22222021221220 is an abundant number, since it is smaller than the sum of its proper divisors (24457343044244).

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

22222021221220 is a wasteful number, since it uses less digits than its factorization.

22222021221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312373839 (or 312373837 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 22222021221220 its reverse (2212212022222), we get a palindrome (24434233243442).

The spelling of 22222021221220 in words is "twenty-two trillion, two hundred twenty-two billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty".