31434111221 has 4 divisors (see below), whose sum is σ = 31434581100. Its totient is φ = 31433641344.

The previous prime is 31434111217. The next prime is 31434111227. The reversal of 31434111221 is 12211143413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7567260100 + 23866851121 = 86990^2 + 154489^2 .

It is a cyclic number.

It is not a de Polignac number, because 31434111221 - 2² = 31434111217 is a prime.

It is a super-2 number, since 2×31434111221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31434111227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113756 + ... + 275333.

It is an arithmetic number, because the mean of its divisors is an integer number (7858645275).

Almost surely, 2^31434111221 is an apocalyptic number.

It is an amenable number.

31434111221 is a deficient number, since it is larger than the sum of its proper divisors (469879).

31434111221 is an equidigital number, since it uses as much as digits as its factorization.

31434111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469878.

The product of its digits is 576, while the sum is 23.

Adding to 31434111221 its reverse (12211143413), we get a palindrome (43645254634).

The spelling of 31434111221 in words is "thirty-one billion, four hundred thirty-four million, one hundred eleven thousand, two hundred twenty-one".