31212133123 has 8 divisors (see below), whose sum is σ = 31942553456. Its totient is φ = 30481920000.

The previous prime is 31212133103. The next prime is 31212133129. The reversal of 31212133123 is 32133121213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212133123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212133094 and 31212133103.

It is not an unprimeable number, because it can be changed into a prime (31212133129) 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, 277123 + ... + 373123.

It is an arithmetic number, because the mean of its divisors is an integer number (3992819182).

Almost surely, 2^31212133123 is an apocalyptic number.

31212133123 is a deficient number, since it is larger than the sum of its proper divisors (730420333).

31212133123 is an equidigital number, since it uses as much as digits as its factorization.

31212133123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103605.

The product of its digits is 648, while the sum is 22.

Adding to 31212133123 its reverse (32133121213), we get a palindrome (63345254336).

The spelling of 31212133123 in words is "thirty-one billion, two hundred twelve million, one hundred thirty-three thousand, one hundred twenty-three".