2132312121221 has 4 divisors (see below), whose sum is σ = 2137525598700. Its totient is φ = 2127098643744.

The previous prime is 2132312121197. The next prime is 2132312121227. The reversal of 2132312121221 is 1221212132312.

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 1905059697121 + 227252424100 = 1380239^2 + 476710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2132312121221 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 (2132312121227) 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, 2606738126 + ... + 2606738943.

It is an arithmetic number, because the mean of its divisors is an integer number (534381399675).

Almost surely, 2^{2132312121221} is an apocalyptic number.

It is an amenable number.

2132312121221 is a deficient number, since it is larger than the sum of its proper divisors (5213477479).

2132312121221 is an equidigital number, since it uses as much as digits as its factorization.

2132312121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5213477478.

The product of its digits is 576, while the sum is 23.

Adding to 2132312121221 its reverse (1221212132312), we get a palindrome (3353524253533).

The spelling of 2132312121221 in words is "two trillion, one hundred thirty-two billion, three hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".