321216772 has 12 divisors (see below), whose sum is σ = 562386636. Its totient is φ = 160534880.

The previous prime is 321216767. The next prime is 321216773. The reversal of 321216772 is 277612123.

It can be written as a sum of positive squares in 2 ways, for example, as 233906436 + 87310336 = 15294^2 + 9344^2 .

It is a super-2 number, since 2×321216772² = 206360429228199968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (321216773) 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, 7879 + ... + 26542.

It is an arithmetic number, because the mean of its divisors is an integer number (46865553).

Almost surely, 2^321216772 is an apocalyptic number.

It is an amenable number.

321216772 is a deficient number, since it is larger than the sum of its proper divisors (241169864).

321216772 is a wasteful number, since it uses less digits than its factorization.

321216772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36758 (or 36756 counting only the distinct ones).

The product of its digits is 7056, while the sum is 31.

The square root of 321216772 is about 17922.5213627994. The cubic root of 321216772 is about 684.8562200228.

Adding to 321216772 its reverse (277612123), we get a palindrome (598828895).

The spelling of 321216772 in words is "three hundred twenty-one million, two hundred sixteen thousand, seven hundred seventy-two".