3132312221 has 4 divisors (see below), whose sum is σ = 3148542012. Its totient is φ = 3116082432.

The previous prime is 3132312193. The next prime is 3132312233. The reversal of 3132312221 is 1222132313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1854249721 + 1278062500 = 43061^2 + 35750^2 .

It is a cyclic number.

It is not a de Polignac number, because 3132312221 - 2¹⁰ = 3132311197 is a prime.

It is a super-2 number, since 2×3132312221² = 19622759699651905682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3132312193 and 3132312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3132312721) 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, 8114606 + ... + 8114991.

It is an arithmetic number, because the mean of its divisors is an integer number (787135503).

Almost surely, 2^3132312221 is an apocalyptic number.

It is an amenable number.

3132312221 is a deficient number, since it is larger than the sum of its proper divisors (16229791).

3132312221 is a wasteful number, since it uses less digits than its factorization.

3132312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16229790.

The product of its digits is 432, while the sum is 20.

The square root of 3132312221 is about 55967.0637160822. The cubic root of 3132312221 is about 1463.1483042510.

Adding to 3132312221 its reverse (1222132313), we get a palindrome (4354444534).

The spelling of 3132312221 in words is "three billion, one hundred thirty-two million, three hundred twelve thousand, two hundred twenty-one".