31221423111 has 8 divisors (see below), whose sum is σ = 42971421184. Its totient is φ = 20142853560.

The previous prime is 31221423109. The next prime is 31221423119. The reversal of 31221423111 is 11132412213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31221423111 - 2¹ = 31221423109 is a prime.

It is a super-2 number, since 2×31221423111² (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 (31221423119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167857021 + ... + 167857206.

It is an arithmetic number, because the mean of its divisors is an integer number (5371427648).

Almost surely, 2^31221423111 is an apocalyptic number.

31221423111 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31221423111 is a deficient number, since it is larger than the sum of its proper divisors (11749998073).

31221423111 is a wasteful number, since it uses less digits than its factorization.

31221423111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335714261.

The product of its digits is 288, while the sum is 21.

Adding to 31221423111 its reverse (11132412213), we get a palindrome (42353835324).

The spelling of 31221423111 in words is "thirty-one billion, two hundred twenty-one million, four hundred twenty-three thousand, one hundred eleven".