2131233102221 has 4 divisors (see below), whose sum is σ = 2132107636092. Its totient is φ = 2130358568352.

The previous prime is 2131233102217. The next prime is 2131233102247. The reversal of 2131233102221 is 1222013321312.

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 1589704897225 + 541528204996 = 1260835^2 + 735886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131233102221 - 2² = 2131233102217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131233102211) 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, 437263280 + ... + 437268153.

It is an arithmetic number, because the mean of its divisors is an integer number (533026909023).

Almost surely, 2^{2131233102221} is an apocalyptic number.

It is an amenable number.

2131233102221 is a deficient number, since it is larger than the sum of its proper divisors (874533871).

2131233102221 is an equidigital number, since it uses as much as digits as its factorization.

2131233102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874533870.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 2131233102221 its reverse (1222013321312), we get a palindrome (3353246423533).

The spelling of 2131233102221 in words is "two trillion, one hundred thirty-one billion, two hundred thirty-three million, one hundred two thousand, two hundred twenty-one".