21222311312 has 20 divisors (see below), whose sum is σ = 41131301580. Its totient is φ = 10607781888.

The previous prime is 21222311311. The next prime is 21222311317. The reversal of 21222311312 is 21311322212.

It can be written as a sum of positive squares in 2 ways, for example, as 13475495056 + 7746816256 = 116084^2 + 88016^2 .

It is a super-2 number, since 2×21222311312² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222311311) 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, 158573 + ... + 259980.

It is an arithmetic number, because the mean of its divisors is an integer number (2056565079).

Almost surely, 2^21222311312 is an apocalyptic number.

It is an amenable number.

21222311312 is a deficient number, since it is larger than the sum of its proper divisors (19908990268).

21222311312 is a wasteful number, since it uses less digits than its factorization.

21222311312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421730 (or 421724 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 21222311312 its reverse (21311322212), we get a palindrome (42533633524).

The spelling of 21222311312 in words is "twenty-one billion, two hundred twenty-two million, three hundred eleven thousand, three hundred twelve".