31020020212123 has 4 divisors (see below), whose sum is σ = 31032218413728. Its totient is φ = 31007822010520.

The previous prime is 31020020212109. The next prime is 31020020212163. The reversal of 31020020212123 is 32121202002013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31020020212123 - 2⁹ = 31020020211611 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 31020020212123.

It is not an unprimeable number, because it can be changed into a prime (31020020212163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6099096988 + ... + 6099102073.

It is an arithmetic number, because the mean of its divisors is an integer number (7758054603432).

Almost surely, 2^{31020020212123} is an apocalyptic number.

31020020212123 is a deficient number, since it is larger than the sum of its proper divisors (12198201605).

31020020212123 is a wasteful number, since it uses less digits than its factorization.

31020020212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12198201604.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31020020212123 its reverse (32121202002013), we get a palindrome (63141222214136).

The spelling of 31020020212123 in words is "thirty-one trillion, twenty billion, twenty million, two hundred twelve thousand, one hundred twenty-three".