22211122210020 has 36 divisors (see below), whose sum is σ = 67373737370940. Its totient is φ = 5922965922624.

The previous prime is 22211122209977. The next prime is 22211122210021. The reversal of 22211122210020 is 2001222111222.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3598093034496 + 18613029175524 = 1896864^2 + 4314282^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22211122209975 and 22211122210002.

It is not an unprimeable number, because it can be changed into a prime (22211122210021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61697561515 + ... + 61697561874.

Almost surely, 2^{22211122210020} is an apocalyptic number.

22211122210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22211122210020 is an abundant number, since it is smaller than the sum of its proper divisors (45162615160920).

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

22211122210020 is a wasteful number, since it uses less digits than its factorization.

22211122210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123395123404 (or 123395123399 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22211122210020 its reverse (2001222111222), we get a palindrome (24212344321242).

The spelling of 22211122210020 in words is "twenty-two trillion, two hundred eleven billion, one hundred twenty-two million, two hundred ten thousand, twenty".