22302131221 has 4 divisors (see below), whose sum is σ = 22302582444. Its totient is φ = 22301680000.

The previous prime is 22302131153. The next prime is 22302131251. The reversal of 22302131221 is 12213120322.

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 13468763025 + 8833368196 = 116055^2 + 93986^2 .

It is a cyclic number.

It is not a de Polignac number, because 22302131221 - 2³¹ = 20154647573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22302131251) 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, 140860 + ... + 253861.

It is an arithmetic number, because the mean of its divisors is an integer number (5575645611).

Almost surely, 2^22302131221 is an apocalyptic number.

It is an amenable number.

22302131221 is a deficient number, since it is larger than the sum of its proper divisors (451223).

22302131221 is an equidigital number, since it uses as much as digits as its factorization.

22302131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451222.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 22302131221 its reverse (12213120322), we get a palindrome (34515251543).

The spelling of 22302131221 in words is "twenty-two billion, three hundred two million, one hundred thirty-one thousand, two hundred twenty-one".