21342211021 has 16 divisors (see below), whose sum is σ = 21763738368. Its totient is φ = 20924006400.

The previous prime is 21342211001. The next prime is 21342211061. The reversal of 21342211021 is 12011224312.

It is a cyclic number.

It is not a de Polignac number, because 21342211021 - 2¹¹ = 21342208973 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 21342211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342211001) 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, 18509581 + ... + 18510733.

It is an arithmetic number, because the mean of its divisors is an integer number (1360233648).

Almost surely, 2^21342211021 is an apocalyptic number.

It is an amenable number.

21342211021 is a deficient number, since it is larger than the sum of its proper divisors (421527347).

21342211021 is a wasteful number, since it uses less digits than its factorization.

21342211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21342211021 its reverse (12011224312), we get a palindrome (33353435333).

The spelling of 21342211021 in words is "twenty-one billion, three hundred forty-two million, two hundred eleven thousand, twenty-one".