21142343023 has 8 divisors (see below), whose sum is σ = 22025097360. Its totient is φ = 20277069120.

The previous prime is 21142342987. The next prime is 21142343039. The reversal of 21142343023 is 32034324112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142343023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142343093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4367640 + ... + 4372477.

It is an arithmetic number, because the mean of its divisors is an integer number (2753137170).

Almost surely, 2^21142343023 is an apocalyptic number.

21142343023 is a deficient number, since it is larger than the sum of its proper divisors (882754337).

21142343023 is an equidigital number, since it uses as much as digits as its factorization.

21142343023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8740217.

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

Adding to 21142343023 its reverse (32034324112), we get a palindrome (53176667135).

The spelling of 21142343023 in words is "twenty-one billion, one hundred forty-two million, three hundred forty-three thousand, twenty-three".