22111221002020 has 48 divisors (see below), whose sum is σ = 48345862135536. Its totient is φ = 8487313920000.

The previous prime is 22111221001993. The next prime is 22111221002023. The reversal of 22111221002020 is 2020012211122.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7505539661376 + 14605681340644 = 2739624^2 + 3821738^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22111221001985 and 22111221002003.

It is not an unprimeable number, because it can be changed into a prime (22111221002023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220973781 + ... + 221073820.

It is an arithmetic number, because the mean of its divisors is an integer number (1007205461157).

Almost surely, 2^{22111221002020} is an apocalyptic number.

22111221002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22111221002020 is an abundant number, since it is smaller than the sum of its proper divisors (26234641133516).

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

22111221002020 is a wasteful number, since it uses less digits than its factorization.

22111221002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442047712 (or 442047710 counting only the distinct ones).

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

Adding to 22111221002020 its reverse (2020012211122), we get a palindrome (24131233213142).

The spelling of 22111221002020 in words is "twenty-two trillion, one hundred eleven billion, two hundred twenty-one million, two thousand, twenty".