21444422013 has 48 divisors (see below), whose sum is σ = 37833194880. Its totient is φ = 11425287168.

The previous prime is 21444421997. The next prime is 21444422017. The reversal of 21444422013 is 31022444412.

21444422013 is a `hidden beast` number, since 2 + 14 + 4 + 442 + 201 + 3 = 666.

It is not a de Polignac number, because 21444422013 - 2⁴ = 21444421997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444422017) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21033 + ... + 208161.

It is an arithmetic number, because the mean of its divisors is an integer number (788191560).

Almost surely, 2^21444422013 is an apocalyptic number.

It is an amenable number.

21444422013 is a deficient number, since it is larger than the sum of its proper divisors (16388772867).

21444422013 is a wasteful number, since it uses less digits than its factorization.

21444422013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187266 (or 187263 counting only the distinct ones).

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

Adding to 21444422013 its reverse (31022444412), we get a palindrome (52466866425).

The spelling of 21444422013 in words is "twenty-one billion, four hundred forty-four million, four hundred twenty-two thousand, thirteen".