13221967972 has 12 divisors (see below), whose sum is σ = 23139586540. Its totient is φ = 6610657536.

The previous prime is 13221967951. The next prime is 13221967973. The reversal of 13221967972 is 27976912231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4260695076 + 8961272896 = 65274^2 + 94664^2 .

It is not an unprimeable number, because it can be changed into a prime (13221967973) 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, 24988 + ... + 164524.

Almost surely, 2^13221967972 is an apocalyptic number.

It is an amenable number.

13221967972 is a deficient number, since it is larger than the sum of its proper divisors (9917618568).

13221967972 is a wasteful number, since it uses less digits than its factorization.

13221967972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163230 (or 163228 counting only the distinct ones).

The product of its digits is 571536, while the sum is 49.

The spelling of 13221967972 in words is "thirteen billion, two hundred twenty-one million, nine hundred sixty-seven thousand, nine hundred seventy-two".