21142034323 has 4 divisors (see below), whose sum is σ = 21276697120. Its totient is φ = 21007371528.

The previous prime is 21142034311. The next prime is 21142034327. The reversal of 21142034323 is 32343024112.

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 21142034323 - 2²¹ = 21139937171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142034327) 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, 67331163 + ... + 67331476.

It is an arithmetic number, because the mean of its divisors is an integer number (5319174280).

Almost surely, 2^21142034323 is an apocalyptic number.

21142034323 is a deficient number, since it is larger than the sum of its proper divisors (134662797).

21142034323 is a wasteful number, since it uses less digits than its factorization.

21142034323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134662796.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21142034323 its reverse (32343024112), we get a palindrome (53485058435).

The spelling of 21142034323 in words is "twenty-one billion, one hundred forty-two million, thirty-four thousand, three hundred twenty-three".