21222302312 has 16 divisors (see below), whose sum is σ = 41163948900. Its totient is φ = 10245249280.

The previous prime is 21222302281. The next prime is 21222302317. The reversal of 21222302312 is 21320322212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21215087716 + 7214596 = 145654^2 + 2686^2 .

It is a super-2 number, since 2×21222302312² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222302317) 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, 45737489 + ... + 45737952.

Almost surely, 2^21222302312 is an apocalyptic number.

It is an amenable number.

21222302312 is a deficient number, since it is larger than the sum of its proper divisors (19941646588).

21222302312 is a wasteful number, since it uses less digits than its factorization.

21222302312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91475476 (or 91475472 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21222302312 its reverse (21320322212), we get a palindrome (42542624524).

The spelling of 21222302312 in words is "twenty-one billion, two hundred twenty-two million, three hundred two thousand, three hundred twelve".