2031132221 has 4 divisors (see below), whose sum is σ = 2032853244. Its totient is φ = 2029411200.

The previous prime is 2031132211. The next prime is 2031132283. The reversal of 2031132221 is 1222311302.

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 1455804025 + 575328196 = 38155^2 + 23986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2031132221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2031132221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031132211) 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, 858740 + ... + 861101.

It is an arithmetic number, because the mean of its divisors is an integer number (508213311).

Almost surely, 2^2031132221 is an apocalyptic number.

It is an amenable number.

2031132221 is a deficient number, since it is larger than the sum of its proper divisors (1721023).

2031132221 is a wasteful number, since it uses less digits than its factorization.

2031132221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721022.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2031132221 is about 45068.0842836702. The cubic root of 2031132221 is about 1266.4247765787.

Adding to 2031132221 its reverse (1222311302), we get a palindrome (3253443523).

The spelling of 2031132221 in words is "two billion, thirty-one million, one hundred thirty-two thousand, two hundred twenty-one".