21202443223 has 4 divisors (see below), whose sum is σ = 22833400408. Its totient is φ = 19571486040.

The previous prime is 21202443221. The next prime is 21202443253. The reversal of 21202443223 is 32234420212.

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 21202443223 - 2¹ = 21202443221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202443221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815478573 + ... + 815478598.

It is an arithmetic number, because the mean of its divisors is an integer number (5708350102).

Almost surely, 2^21202443223 is an apocalyptic number.

21202443223 is a deficient number, since it is larger than the sum of its proper divisors (1630957185).

21202443223 is a wasteful number, since it uses less digits than its factorization.

21202443223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630957184.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21202443223 its reverse (32234420212), we get a palindrome (53436863435).

The spelling of 21202443223 in words is "twenty-one billion, two hundred two million, four hundred forty-three thousand, two hundred twenty-three".