22042231021 has 4 divisors (see below), whose sum is σ = 22090463932. Its totient is φ = 21993998112.

The previous prime is 22042231019. The next prime is 22042231039. The reversal of 22042231021 is 12013224022.

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 19189175625 + 2853055396 = 138525^2 + 53414^2 .

It is a cyclic number.

It is not a de Polignac number, because 22042231021 - 2¹ = 22042231019 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 22042231021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22042231091) 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, 24115770 + ... + 24116683.

It is an arithmetic number, because the mean of its divisors is an integer number (5522615983).

Almost surely, 2^22042231021 is an apocalyptic number.

It is an amenable number.

22042231021 is a deficient number, since it is larger than the sum of its proper divisors (48232911).

22042231021 is an equidigital number, since it uses as much as digits as its factorization.

22042231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48232910.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 22042231021 its reverse (12013224022), we get a palindrome (34055455043).

The spelling of 22042231021 in words is "twenty-two billion, forty-two million, two hundred thirty-one thousand, twenty-one".