31311132022221 has 16 divisors (see below), whose sum is σ = 44690286566400. Its totient is φ = 19440274652208.

The previous prime is 31311132022187. The next prime is 31311132022231. The reversal of 31311132022221 is 12222023111313.

It is not a de Polignac number, because 31311132022221 - 2¹¹ = 31311132020173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31311132022191 and 31311132022200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311132022231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4655234821 + ... + 4655241546.

It is an arithmetic number, because the mean of its divisors is an integer number (2793142910400).

Almost surely, 2^{31311132022221} is an apocalyptic number.

It is an amenable number.

31311132022221 is a deficient number, since it is larger than the sum of its proper divisors (13379154544179).

31311132022221 is a wasteful number, since it uses less digits than its factorization.

31311132022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9310476448.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31311132022221 its reverse (12222023111313), we get a palindrome (43533155133534).

The spelling of 31311132022221 in words is "thirty-one trillion, three hundred eleven billion, one hundred thirty-two million, twenty-two thousand, two hundred twenty-one".