31103242221 has 8 divisors (see below), whose sum is σ = 41620705504. Its totient is φ = 20660636880.

The previous prime is 31103242151. The next prime is 31103242259. The reversal of 31103242221 is 12224230113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31103242221 - 2¹⁵ = 31103209453 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 (31103247221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18713515 + ... + 18715176.

It is an arithmetic number, because the mean of its divisors is an integer number (5202588188).

Almost surely, 2^31103242221 is an apocalyptic number.

It is an amenable number.

31103242221 is a deficient number, since it is larger than the sum of its proper divisors (10517463283).

31103242221 is a wasteful number, since it uses less digits than its factorization.

31103242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37428971.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31103242221 its reverse (12224230113), we get a palindrome (43327472334).

The spelling of 31103242221 in words is "thirty-one billion, one hundred three million, two hundred forty-two thousand, two hundred twenty-one".