21255322422 has 64 divisors (see below), whose sum is σ = 44539545600. Its totient is φ = 6754544640.

The previous prime is 21255322421. The next prime is 21255322423. The reversal of 21255322422 is 22422355212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21255322421) and next prime (21255322423).

It is a self number, because there is not a number n which added to its sum of digits gives 21255322422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255322421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3626118 + ... + 3631974.

It is an arithmetic number, because the mean of its divisors is an integer number (695930400).

Almost surely, 2^21255322422 is an apocalyptic number.

21255322422 is an abundant number, since it is smaller than the sum of its proper divisors (23284223178).

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

21255322422 is a wasteful number, since it uses less digits than its factorization.

21255322422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6181.

The product of its digits is 19200, while the sum is 30.

Adding to 21255322422 its reverse (22422355212), we get a palindrome (43677677634).

The spelling of 21255322422 in words is "twenty-one billion, two hundred fifty-five million, three hundred twenty-two thousand, four hundred twenty-two".