21222131322 has 32 divisors (see below), whose sum is σ = 51361126272. Its totient is φ = 5706791424.

The previous prime is 21222131321. The next prime is 21222131351. The reversal of 21222131322 is 22313122212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21222131321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14860723 + ... + 14862150.

It is an arithmetic number, because the mean of its divisors is an integer number (1605035196).

Almost surely, 2^21222131322 is an apocalyptic number.

21222131322 is an abundant number, since it is smaller than the sum of its proper divisors (30138994950).

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

21222131322 is a wasteful number, since it uses less digits than its factorization.

21222131322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29722902.

The product of its digits is 576, while the sum is 21.

Adding to 21222131322 its reverse (22313122212), we get a palindrome (43535253534).

The spelling of 21222131322 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirty-one thousand, three hundred twenty-two".