21342402223 has 4 divisors (see below), whose sum is σ = 21355767880. Its totient is φ = 21329036568.

The previous prime is 21342402173. The next prime is 21342402247. The reversal of 21342402223 is 32220424312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342402223 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 (21342442223) 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, 6680433 + ... + 6683626.

It is an arithmetic number, because the mean of its divisors is an integer number (5338941970).

Almost surely, 2^21342402223 is an apocalyptic number.

21342402223 is a deficient number, since it is larger than the sum of its proper divisors (13365657).

21342402223 is a wasteful number, since it uses less digits than its factorization.

21342402223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13365656.

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

Adding to 21342402223 its reverse (32220424312), we get a palindrome (53562826535).

The spelling of 21342402223 in words is "twenty-one billion, three hundred forty-two million, four hundred two thousand, two hundred twenty-three".