31110001221 has 8 divisors (see below), whose sum is σ = 44670771040. Its totient is φ = 19144616112.

The previous prime is 31110001211. The next prime is 31110001229. The reversal of 31110001221 is 12210001113.

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

It is not a de Polignac number, because 31110001221 - 2⁷ = 31110001093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31110001197 and 31110001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31110001229) 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 7 ways as a sum of consecutive naturals, for example, 398846131 + ... + 398846208.

It is an arithmetic number, because the mean of its divisors is an integer number (5583846380).

Almost surely, 2^31110001221 is an apocalyptic number.

It is an amenable number.

31110001221 is a deficient number, since it is larger than the sum of its proper divisors (13560769819).

31110001221 is a wasteful number, since it uses less digits than its factorization.

31110001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797692355.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 31110001221 its reverse (12210001113), we get a palindrome (43320002334).

The spelling of 31110001221 in words is "thirty-one billion, one hundred ten million, one thousand, two hundred twenty-one".