21214142123 has 4 divisors (see below), whose sum is σ = 21401878008. Its totient is φ = 21026406240.

The previous prime is 21214142119. The next prime is 21214142153. The reversal of 21214142123 is 32124141212.

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 21214142123 - 2² = 21214142119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214142153) 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, 93867773 + ... + 93867998.

It is an arithmetic number, because the mean of its divisors is an integer number (5350469502).

Almost surely, 2^21214142123 is an apocalyptic number.

21214142123 is a deficient number, since it is larger than the sum of its proper divisors (187735885).

21214142123 is a wasteful number, since it uses less digits than its factorization.

21214142123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187735884.

The product of its digits is 768, while the sum is 23.

Adding to 21214142123 its reverse (32124141212), we get a palindrome (53338283335).

The spelling of 21214142123 in words is "twenty-one billion, two hundred fourteen million, one hundred forty-two thousand, one hundred twenty-three".