21222351222 has 32 divisors (see below), whose sum is σ = 42917061600. Its totient is φ = 6995509248.

The previous prime is 21222351221. The next prime is 21222351223. The reversal of 21222351222 is 22215322212.

It is an interprime number because it is at equal distance from previous prime (21222351221) and next prime (21222351223).

It is a junction number, because it is equal to n+sod(n) for n = 21222351192 and 21222351201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222351221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736054 + ... + 764342.

It is an arithmetic number, because the mean of its divisors is an integer number (1341158175).

Almost surely, 2^21222351222 is an apocalyptic number.

21222351222 is an abundant number, since it is smaller than the sum of its proper divisors (21694710378).

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

21222351222 is a wasteful number, since it uses less digits than its factorization.

21222351222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29680.

The product of its digits is 1920, while the sum is 24.

Adding to 21222351222 its reverse (22215322212), we get a palindrome (43437673434).

The spelling of 21222351222 in words is "twenty-one billion, two hundred twenty-two million, three hundred fifty-one thousand, two hundred twenty-two".