31221223223 has 8 divisors (see below), whose sum is σ = 32303149056. Its totient is φ = 30143971800.

The previous prime is 31221223219. The next prime is 31221223249. The reversal of 31221223223 is 32232212213.

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

It is a cyclic number.

It is not a de Polignac number, because 31221223223 - 2² = 31221223219 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 (31221223213) 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, 1155011 + ... + 1181732.

It is an arithmetic number, because the mean of its divisors is an integer number (4037893632).

Almost surely, 2^31221223223 is an apocalyptic number.

31221223223 is a deficient number, since it is larger than the sum of its proper divisors (1081925833).

31221223223 is a wasteful number, since it uses less digits than its factorization.

31221223223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337205.

The product of its digits is 1728, while the sum is 23.

Adding to 31221223223 its reverse (32232212213), we get a palindrome (63453435436).

The spelling of 31221223223 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty-three thousand, two hundred twenty-three".