32131121221 has 4 divisors (see below), whose sum is σ = 32131591744. Its totient is φ = 32130650700.

The previous prime is 32131121207. The next prime is 32131121227. The reversal of 32131121221 is 12212113123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 32131121221 - 2⁵ = 32131121189 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 (32131121227) 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, 110925 + ... + 276706.

It is an arithmetic number, because the mean of its divisors is an integer number (8032897936).

Almost surely, 2^32131121221 is an apocalyptic number.

It is an amenable number.

32131121221 is a deficient number, since it is larger than the sum of its proper divisors (470523).

32131121221 is an equidigital number, since it uses as much as digits as its factorization.

32131121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470522.

The product of its digits is 144, while the sum is 19.

Adding to 32131121221 its reverse (12212113123), we get a palindrome (44343234344).

The spelling of 32131121221 in words is "thirty-two billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty-one".