31001113221 has 8 divisors (see below), whose sum is σ = 44514419040. Its totient is φ = 19077608112.

The previous prime is 31001113219. The next prime is 31001113237. The reversal of 31001113221 is 12231110013.

It is a happy number.

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

It is not a de Polignac number, because 31001113221 - 2¹ = 31001113219 is a prime.

It is a super-2 number, since 2×31001113221² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31001113221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001113211) 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, 397450131 + ... + 397450208.

It is an arithmetic number, because the mean of its divisors is an integer number (5564302380).

Almost surely, 2^31001113221 is an apocalyptic number.

It is an amenable number.

31001113221 is a deficient number, since it is larger than the sum of its proper divisors (13513305819).

31001113221 is a wasteful number, since it uses less digits than its factorization.

31001113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794900355.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31001113221 its reverse (12231110013), we get a palindrome (43232223234).

The spelling of 31001113221 in words is "thirty-one billion, one million, one hundred thirteen thousand, two hundred twenty-one".