31220123123 has 16 divisors (see below), whose sum is σ = 35827008000. Its totient is φ = 26650187136.

The previous prime is 31220123119. The next prime is 31220123141. The reversal of 31220123123 is 32132102213.

It is a cyclic number.

It is not a de Polignac number, because 31220123123 - 2² = 31220123119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31220123095 and 31220123104.

It is not an unprimeable number, because it can be changed into a prime (31220123113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1691915 + ... + 1710267.

It is an arithmetic number, because the mean of its divisors is an integer number (2239188000).

Almost surely, 2^31220123123 is an apocalyptic number.

31220123123 is a deficient number, since it is larger than the sum of its proper divisors (4606884877).

31220123123 is a wasteful number, since it uses less digits than its factorization.

31220123123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19346.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31220123123 its reverse (32132102213), we get a palindrome (63352225336).

The spelling of 31220123123 in words is "thirty-one billion, two hundred twenty million, one hundred twenty-three thousand, one hundred twenty-three".