22020131131021 has 4 divisors (see below), whose sum is σ = 22147415126172. Its totient is φ = 21892847135872.

The previous prime is 22020131131001. The next prime is 22020131131039. The reversal of 22020131131021 is 12013113102022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18919411626025 + 3100719504996 = 4349645^2 + 1760886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22020131131021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22020131131021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22020131131001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63641997316 + ... + 63641997661.

It is an arithmetic number, because the mean of its divisors is an integer number (5536853781543).

Almost surely, 2^{22020131131021} is an apocalyptic number.

It is an amenable number.

22020131131021 is a deficient number, since it is larger than the sum of its proper divisors (127283995151).

22020131131021 is a wasteful number, since it uses less digits than its factorization.

22020131131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127283995150.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 22020131131021 its reverse (12013113102022), we get a palindrome (34033244233043).

The spelling of 22020131131021 in words is "twenty-two trillion, twenty billion, one hundred thirty-one million, one hundred thirty-one thousand, twenty-one".