21442334013 has 20 divisors (see below), whose sum is σ = 32046104640. Its totient is φ = 14288211432.

The previous prime is 21442333999. The next prime is 21442334029. The reversal of 21442334013 is 31043324412.

21442334013 is a `hidden beast` number, since 21 + 4 + 4 + 233 + 401 + 3 = 666.

It is not a de Polignac number, because 21442334013 - 2⁹ = 21442333501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442334083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 115756 + ... + 237242.

It is an arithmetic number, because the mean of its divisors is an integer number (1602305232).

Almost surely, 2^21442334013 is an apocalyptic number.

It is an amenable number.

21442334013 is a deficient number, since it is larger than the sum of its proper divisors (10603770627).

21442334013 is a wasteful number, since it uses less digits than its factorization.

21442334013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123678 (or 123669 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21442334013 its reverse (31043324412), we get a palindrome (52485658425).

The spelling of 21442334013 in words is "twenty-one billion, four hundred forty-two million, three hundred thirty-four thousand, thirteen".