31220111423 has 4 divisors (see below), whose sum is σ = 31465939200. Its totient is φ = 30974283648.

The previous prime is 31220111413. The next prime is 31220111449. The reversal of 31220111423 is 32411102213.

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

It is a cyclic number.

It is not a de Polignac number, because 31220111423 - 2²⁴ = 31203334207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220111395 and 31220111404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220111413) 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 3 ways as a sum of consecutive naturals, for example, 122913698 + ... + 122913951.

It is an arithmetic number, because the mean of its divisors is an integer number (7866484800).

Almost surely, 2^31220111423 is an apocalyptic number.

31220111423 is a deficient number, since it is larger than the sum of its proper divisors (245827777).

31220111423 is a wasteful number, since it uses less digits than its factorization.

31220111423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245827776.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31220111423 its reverse (32411102213), we get a palindrome (63631213636).

The spelling of 31220111423 in words is "thirty-one billion, two hundred twenty million, one hundred eleven thousand, four hundred twenty-three".