21342013021 has 16 divisors (see below), whose sum is σ = 24694185600. Its totient is φ = 18065838528.

The previous prime is 21342013013. The next prime is 21342013057. The reversal of 21342013021 is 12031024312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21342013021 - 2³ = 21342013013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21342013021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342013081) 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 15 ways as a sum of consecutive naturals, for example, 2010195 + ... + 2020783.

It is an arithmetic number, because the mean of its divisors is an integer number (1543386600).

Almost surely, 2^21342013021 is an apocalyptic number.

It is an amenable number.

21342013021 is a deficient number, since it is larger than the sum of its proper divisors (3352172579).

21342013021 is a wasteful number, since it uses less digits than its factorization.

21342013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14148.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21342013021 its reverse (12031024312), we get a palindrome (33373037333).

The spelling of 21342013021 in words is "twenty-one billion, three hundred forty-two million, thirteen thousand, twenty-one".