21202214423 has 4 divisors (see below), whose sum is σ = 22833154008. Its totient is φ = 19571274840.

The previous prime is 21202214417. The next prime is 21202214441. The reversal of 21202214423 is 32441220212.

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

It is a de Polignac number, because none of the positive numbers 2^k-21202214423 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 (21202214443) 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, 815469773 + ... + 815469798.

It is an arithmetic number, because the mean of its divisors is an integer number (5708288502).

Almost surely, 2^21202214423 is an apocalyptic number.

21202214423 is a deficient number, since it is larger than the sum of its proper divisors (1630939585).

21202214423 is a wasteful number, since it uses less digits than its factorization.

21202214423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630939584.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21202214423 its reverse (32441220212), we get a palindrome (53643434635).

The spelling of 21202214423 in words is "twenty-one billion, two hundred two million, two hundred fourteen thousand, four hundred twenty-three".