921238312 has 16 divisors (see below), whose sum is σ = 1730366100. Its totient is φ = 459807360.

The previous prime is 921238309. The next prime is 921238327. The reversal of 921238312 is 213832129.

It can be written as a sum of positive squares in 2 ways, for example, as 917726436 + 3511876 = 30294^2 + 1874^2 .

It is a super-3 number, since 3×921238312³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96639 + ... + 105742.

Almost surely, 2^921238312 is an apocalyptic number.

It is an amenable number.

921238312 is a deficient number, since it is larger than the sum of its proper divisors (809127788).

921238312 is a wasteful number, since it uses less digits than its factorization.

921238312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202956 (or 202952 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 921238312 is about 30351.9078807247. The cubic root of 921238312 is about 973.0249959514.

It can be divided in two parts, 9212 and 38312, that added together give a square (47524 = 218²).

The spelling of 921238312 in words is "nine hundred twenty-one million, two hundred thirty-eight thousand, three hundred twelve".