2131031332221 has 16 divisors (see below), whose sum is σ = 3130371862848. Its totient is φ = 1278746672000.

The previous prime is 2131031332217. The next prime is 2131031332259. The reversal of 2131031332221 is 1222331301312.

It is a cyclic number.

It is not a de Polignac number, because 2131031332221 - 2² = 2131031332217 is a prime.

It is a super-2 number, since 2×2131031332221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2131031332191 and 2131031332200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131031332201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319683336 + ... + 319690001.

It is an arithmetic number, because the mean of its divisors is an integer number (195648241428).

Almost surely, 2^{2131031332221} is an apocalyptic number.

It is an amenable number.

2131031332221 is a deficient number, since it is larger than the sum of its proper divisors (999340530627).

2131031332221 is a wasteful number, since it uses less digits than its factorization.

2131031332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639373452.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 2131031332221 its reverse (1222331301312), we get a palindrome (3353362633533).

The spelling of 2131031332221 in words is "two trillion, one hundred thirty-one billion, thirty-one million, three hundred thirty-two thousand, two hundred twenty-one".