31312233121 has 8 divisors (see below), whose sum is σ = 34224163904. Its totient is φ = 28472202000.

The previous prime is 31312233109. The next prime is 31312233157. The reversal of 31312233121 is 12133221313.

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

It is a cyclic number.

It is not a de Polignac number, because 31312233121 - 2⁷ = 31312232993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31312233092 and 31312233101.

It is not an unprimeable number, because it can be changed into a prime (31312231121) 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, 17974005 + ... + 17975746.

It is an arithmetic number, because the mean of its divisors is an integer number (4278020488).

Almost surely, 2^31312233121 is an apocalyptic number.

It is an amenable number.

31312233121 is a deficient number, since it is larger than the sum of its proper divisors (2911930783).

31312233121 is a wasteful number, since it uses less digits than its factorization.

31312233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35949831.

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

Adding to 31312233121 its reverse (12133221313), we get a palindrome (43445454434).

The spelling of 31312233121 in words is "thirty-one billion, three hundred twelve million, two hundred thirty-three thousand, one hundred twenty-one".