31222220212231 has 4 divisors (see below), whose sum is σ = 31222367853712. Its totient is φ = 31222072570752.

The previous prime is 31222220212219. The next prime is 31222220212243. The reversal of 31222220212231 is 13221202222213.

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

It is an interprime number because it is at equal distance from previous prime (31222220212219) and next prime (31222220212243).

It is a cyclic number.

It is not a de Polignac number, because 31222220212231 - 2⁴¹ = 29023196956679 is a prime.

It is a super-2 number, since 2×31222220212231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31222220212196 and 31222220212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222220213231) 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, 73503075 + ... + 73926628.

It is an arithmetic number, because the mean of its divisors is an integer number (7805591963428).

Almost surely, 2^{31222220212231} is an apocalyptic number.

31222220212231 is a deficient number, since it is larger than the sum of its proper divisors (147641481).

31222220212231 is a wasteful number, since it uses less digits than its factorization.

31222220212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147641480.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 31222220212231 its reverse (13221202222213), we get a palindrome (44443422434444).

The spelling of 31222220212231 in words is "thirty-one trillion, two hundred twenty-two billion, two hundred twenty million, two hundred twelve thousand, two hundred thirty-one".