31211302123 has 4 divisors (see below), whose sum is σ = 31391714448. Its totient is φ = 31030889800.

The previous prime is 31211302037. The next prime is 31211302141. The reversal of 31211302123 is 32120311213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32120311213 = 97 ⋅331137229.

It is a cyclic number.

It is not a de Polignac number, because 31211302123 - 2¹³ = 31211293931 is a prime.

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 31211302123.

It is not an unprimeable number, because it can be changed into a prime (31211302183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90205903 + ... + 90206248.

It is an arithmetic number, because the mean of its divisors is an integer number (7847928612).

Almost surely, 2^31211302123 is an apocalyptic number.

31211302123 is a deficient number, since it is larger than the sum of its proper divisors (180412325).

31211302123 is a wasteful number, since it uses less digits than its factorization.

31211302123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180412324.

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

Adding to 31211302123 its reverse (32120311213), we get a palindrome (63331613336).

The spelling of 31211302123 in words is "thirty-one billion, two hundred eleven million, three hundred two thousand, one hundred twenty-three".