1022130312221 has 4 divisors (see below), whose sum is σ = 1022146995612. Its totient is φ = 1022113628832.

The previous prime is 1022130312191. The next prime is 1022130312239. The reversal of 1022130312221 is 1222130312201.

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 522367562500 + 499762749721 = 722750^2 + 706939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022130312221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022130312193 and 1022130312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022130312241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8249456 + ... + 8372441.

It is an arithmetic number, because the mean of its divisors is an integer number (255536748903).

Almost surely, 2^{1022130312221} is an apocalyptic number.

It is an amenable number.

1022130312221 is a deficient number, since it is larger than the sum of its proper divisors (16683391).

1022130312221 is an equidigital number, since it uses as much as digits as its factorization.

1022130312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16683390.

The product of its (nonzero) digits is 288, while the sum is 20.

Subtracting from 1022130312221 its sum of digits (20), we obtain a palindrome (1022130312201).

Adding to 1022130312221 its reverse (1222130312201), we get a palindrome (2244260624422).

The spelling of 1022130312221 in words is "one trillion, twenty-two billion, one hundred thirty million, three hundred twelve thousand, two hundred twenty-one".