31430332111221 has 24 divisors (see below), whose sum is σ = 45550810805760. Its totient is φ = 20883722400096.

The previous prime is 31430332111219. The next prime is 31430332111229. The reversal of 31430332111221 is 12211123303413.

31430332111221 is a `hidden beast` number, since 3 + 1 + 4 + 303 + 321 + 1 + 12 + 21 = 666.

It is not a de Polignac number, because 31430332111221 - 2¹ = 31430332111219 is a prime.

It is a super-2 number, since 2×31430332111221² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31430332111229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3222055 + ... + 8558171.

It is an arithmetic number, because the mean of its divisors is an integer number (1897950450240).

Almost surely, 2^{31430332111221} is an apocalyptic number.

It is an amenable number.

31430332111221 is a deficient number, since it is larger than the sum of its proper divisors (14120478694539).

31430332111221 is a wasteful number, since it uses less digits than its factorization.

31430332111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338305 (or 5338302 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

Adding to 31430332111221 its reverse (12211123303413), we get a palindrome (43641455414634).

The spelling of 31430332111221 in words is "thirty-one trillion, four hundred thirty billion, three hundred thirty-two million, one hundred eleven thousand, two hundred twenty-one".