3231221138 has 4 divisors (see below), whose sum is σ = 4846831710. Its totient is φ = 1615610568.

The previous prime is 3231221131. The next prime is 3231221143. The reversal of 3231221138 is 8311221323.

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

It can be written as a sum of positive squares in only one way, i.e., 3203899609 + 27321529 = 56603^2 + 5227^2 .

It is not an unprimeable number, because it can be changed into a prime (3231221131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 807805283 + ... + 807805286.

Almost surely, 2^3231221138 is an apocalyptic number.

3231221138 is a deficient number, since it is larger than the sum of its proper divisors (1615610572).

3231221138 is a wasteful number, since it uses less digits than its factorization.

3231221138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615610571.

The product of its digits is 1728, while the sum is 26.

The square root of 3231221138 is about 56843.8311340817. The cubic root of 3231221138 is about 1478.3895829208.

The spelling of 3231221138 in words is "three billion, two hundred thirty-one million, two hundred twenty-one thousand, one hundred thirty-eight".