20131402123 has 4 divisors (see below), whose sum is σ = 23007316720. Its totient is φ = 17255487528.

The previous prime is 20131402099. The next prime is 20131402127. The reversal of 20131402123 is 32120413102.

It is a happy number.

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 20131402123 - 2⁹ = 20131401611 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 20131402123.

It is not an unprimeable number, because it can be changed into a prime (20131402127) 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, 1437957288 + ... + 1437957301.

It is an arithmetic number, because the mean of its divisors is an integer number (5751829180).

Almost surely, 2^20131402123 is an apocalyptic number.

20131402123 is a deficient number, since it is larger than the sum of its proper divisors (2875914597).

20131402123 is an equidigital number, since it uses as much as digits as its factorization.

20131402123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875914596.

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

Adding to 20131402123 its reverse (32120413102), we get a palindrome (52251815225).

The spelling of 20131402123 in words is "twenty billion, one hundred thirty-one million, four hundred two thousand, one hundred twenty-three".