21231422312 has 32 divisors (see below), whose sum is σ = 39937681800. Its totient is φ = 10581417984.

The previous prime is 21231422293. The next prime is 21231422341. The reversal of 21231422312 is 21322413212.

It can be written as a sum of positive squares in 4 ways, for example, as 21148721476 + 82700836 = 145426^2 + 9094^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7710728 + ... + 7713480.

Almost surely, 2^21231422312 is an apocalyptic number.

It is an amenable number.

21231422312 is a deficient number, since it is larger than the sum of its proper divisors (18706259488).

21231422312 is a wasteful number, since it uses less digits than its factorization.

21231422312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5525 (or 5521 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

Adding to 21231422312 its reverse (21322413212), we get a palindrome (42553835524).

The spelling of 21231422312 in words is "twenty-one billion, two hundred thirty-one million, four hundred twenty-two thousand, three hundred twelve".