2131243221 has 8 divisors (see below), whose sum is σ = 2848745664. Its totient is φ = 1417284800.

The previous prime is 2131243187. The next prime is 2131243307. The reversal of 2131243221 is 1223421312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2131243221 - 2⁶ = 2131243157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131243021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884601 + ... + 887006.

It is an arithmetic number, because the mean of its divisors is an integer number (356093208).

Almost surely, 2^2131243221 is an apocalyptic number.

It is an amenable number.

2131243221 is a deficient number, since it is larger than the sum of its proper divisors (717502443).

2131243221 is a wasteful number, since it uses less digits than its factorization.

2131243221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772011.

The product of its digits is 576, while the sum is 21.

The square root of 2131243221 is about 46165.3898608037. The cubic root of 2131243221 is about 1286.8986293363.

Adding to 2131243221 its reverse (1223421312), we get a palindrome (3354664533).

The spelling of 2131243221 in words is "two billion, one hundred thirty-one million, two hundred forty-three thousand, two hundred twenty-one".