31222303221 has 16 divisors (see below), whose sum is σ = 42912674048. Its totient is φ = 20177553600.

The previous prime is 31222303213. The next prime is 31222303247. The reversal of 31222303221 is 12230322213.

It is a happy number.

It is not a de Polignac number, because 31222303221 - 2³ = 31222303213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222303271) 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, 488890 + ... + 549051.

It is an arithmetic number, because the mean of its divisors is an integer number (2682042128).

Almost surely, 2^31222303221 is an apocalyptic number.

It is an amenable number.

31222303221 is a deficient number, since it is larger than the sum of its proper divisors (11690370827).

31222303221 is a wasteful number, since it uses less digits than its factorization.

31222303221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038252.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31222303221 its reverse (12230322213), we get a palindrome (43452625434).

The spelling of 31222303221 in words is "thirty-one billion, two hundred twenty-two million, three hundred three thousand, two hundred twenty-one".