21202143223 has 4 divisors (see below), whose sum is σ = 21933251640. Its totient is φ = 20471034808.

The previous prime is 21202143217. The next prime is 21202143239. The reversal of 21202143223 is 32234120212.

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

It is not a de Polignac number, because 21202143223 - 2⁵ = 21202143191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202143194 and 21202143203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202143203) 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, 365554165 + ... + 365554222.

It is an arithmetic number, because the mean of its divisors is an integer number (5483312910).

Almost surely, 2^21202143223 is an apocalyptic number.

21202143223 is a deficient number, since it is larger than the sum of its proper divisors (731108417).

21202143223 is an equidigital number, since it uses as much as digits as its factorization.

21202143223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731108416.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21202143223 its reverse (32234120212), we get a palindrome (53436263435).

The spelling of 21202143223 in words is "twenty-one billion, two hundred two million, one hundred forty-three thousand, two hundred twenty-three".