21142033423 has 16 divisors (see below), whose sum is σ = 24632838720. Its totient is φ = 17769263616.

The previous prime is 21142033403. The next prime is 21142033427. The reversal of 21142033423 is 32433024112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142033423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142033427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 643233 + ... + 675301.

It is an arithmetic number, because the mean of its divisors is an integer number (1539552420).

Almost surely, 2^21142033423 is an apocalyptic number.

21142033423 is a deficient number, since it is larger than the sum of its proper divisors (3490805297).

21142033423 is a wasteful number, since it uses less digits than its factorization.

21142033423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33906.

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

Adding to 21142033423 its reverse (32433024112), we get a palindrome (53575057535).

The spelling of 21142033423 in words is "twenty-one billion, one hundred forty-two million, thirty-three thousand, four hundred twenty-three".