21342444211 has 8 divisors (see below), whose sum is σ = 24294956544. Its totient is φ = 18558646920.

The previous prime is 21342444191. The next prime is 21342444217. The reversal of 21342444211 is 11244424312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21342444211 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 21342444211.

It is not an unprimeable number, because it can be changed into a prime (21342444217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42178491 + ... + 42178996.

It is an arithmetic number, because the mean of its divisors is an integer number (3036869568).

Almost surely, 2^21342444211 is an apocalyptic number.

21342444211 is a deficient number, since it is larger than the sum of its proper divisors (2952512333).

21342444211 is a wasteful number, since it uses less digits than its factorization.

21342444211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84357521.

The product of its digits is 6144, while the sum is 28.

Adding to 21342444211 its reverse (11244424312), we get a palindrome (32586868523).

It can be divided in two parts, 213 and 42444211, that added together give a palindrome (42444424).

The spelling of 21342444211 in words is "twenty-one billion, three hundred forty-two million, four hundred forty-four thousand, two hundred eleven".