31321103221 has 4 divisors (see below), whose sum is σ = 31560195744. Its totient is φ = 31082010700.

The previous prime is 31321103201. The next prime is 31321103327. The reversal of 31321103221 is 12230112313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12230112313 = 71 ⋅172255103.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321103221 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 (31321103201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119546065 + ... + 119546326.

It is an arithmetic number, because the mean of its divisors is an integer number (7890048936).

Almost surely, 2^31321103221 is an apocalyptic number.

It is an amenable number.

31321103221 is a deficient number, since it is larger than the sum of its proper divisors (239092523).

31321103221 is a wasteful number, since it uses less digits than its factorization.

31321103221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239092522.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31321103221 its reverse (12230112313), we get a palindrome (43551215534).

The spelling of 31321103221 in words is "thirty-one billion, three hundred twenty-one million, one hundred three thousand, two hundred twenty-one".