21442422213 has 6 divisors (see below), whose sum is σ = 30972387654. Its totient is φ = 14294948136.

The previous prime is 21442422193. The next prime is 21442422223. The reversal of 21442422213 is 31222424412.

It is a happy number.

21442422213 is a `hidden beast` number, since 2 + 1 + 4 + 424 + 22 + 213 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13984718049 + 7457704164 = 118257^2 + 86358^2 .

It is not a de Polignac number, because 21442422213 - 2⁵ = 21442422181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442422223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1191245670 + ... + 1191245687.

It is an arithmetic number, because the mean of its divisors is an integer number (5162064609).

Almost surely, 2^21442422213 is an apocalyptic number.

It is an amenable number.

21442422213 is a deficient number, since it is larger than the sum of its proper divisors (9529965441).

21442422213 is a wasteful number, since it uses less digits than its factorization.

21442422213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382491363 (or 2382491360 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

Adding to 21442422213 its reverse (31222424412), we get a palindrome (52664846625).

The spelling of 21442422213 in words is "twenty-one billion, four hundred forty-two million, four hundred twenty-two thousand, two hundred thirteen".