21142040223 has 4 divisors (see below), whose sum is σ = 28189386968. Its totient is φ = 14094693480.

The previous prime is 21142040219. The next prime is 21142040263. The reversal of 21142040223 is 32204024112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21142040223 - 2² = 21142040219 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 21142040223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142040263) 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, 3523673368 + ... + 3523673373.

It is an arithmetic number, because the mean of its divisors is an integer number (7047346742).

Almost surely, 2^21142040223 is an apocalyptic number.

21142040223 is a deficient number, since it is larger than the sum of its proper divisors (7047346745).

21142040223 is an equidigital number, since it uses as much as digits as its factorization.

21142040223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047346744.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21142040223 its reverse (32204024112), we get a palindrome (53346064335).

The spelling of 21142040223 in words is "twenty-one billion, one hundred forty-two million, forty thousand, two hundred twenty-three".