31321201123 has 16 divisors (see below), whose sum is σ = 31860993600. Its totient is φ = 30786739200.

The previous prime is 31321201099. The next prime is 31321201129. The reversal of 31321201123 is 32110212313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321201123 is a prime.

It is a super-2 number, since 2×31321201123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31321201123.

It is not an unprimeable number, because it can be changed into a prime (31321201129) 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, 13802833 + ... + 13805101.

It is an arithmetic number, because the mean of its divisors is an integer number (1991312100).

Almost surely, 2^31321201123 is an apocalyptic number.

31321201123 is a deficient number, since it is larger than the sum of its proper divisors (539792477).

31321201123 is a wasteful number, since it uses less digits than its factorization.

31321201123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31321201123 its reverse (32110212313), we get a palindrome (63431413436).

The spelling of 31321201123 in words is "thirty-one billion, three hundred twenty-one million, two hundred one thousand, one hundred twenty-three".