31223140121 has 4 divisors (see below), whose sum is σ = 31230109392. Its totient is φ = 31216170852.

The previous prime is 31223140099. The next prime is 31223140129. The reversal of 31223140121 is 12104132213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31223140121 - 2⁶ = 31223140057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31223140093 and 31223140102.

It is not an unprimeable number, because it can be changed into a prime (31223140129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3477911 + ... + 3486876.

It is an arithmetic number, because the mean of its divisors is an integer number (7807527348).

Almost surely, 2^31223140121 is an apocalyptic number.

It is an amenable number.

31223140121 is a deficient number, since it is larger than the sum of its proper divisors (6969271).

31223140121 is an equidigital number, since it uses as much as digits as its factorization.

31223140121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6969270.

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

Adding to 31223140121 its reverse (12104132213), we get a palindrome (43327272334).

The spelling of 31223140121 in words is "thirty-one billion, two hundred twenty-three million, one hundred forty thousand, one hundred twenty-one".