21022422013 has 4 divisors (see below), whose sum is σ = 21215288380. Its totient is φ = 20829555648.

The previous prime is 21022421999. The next prime is 21022422203. The reversal of 21022422013 is 31022422012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15575539204 + 5446882809 = 124802^2 + 73803^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022422013 - 2¹³ = 21022413821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022422713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96433020 + ... + 96433237.

It is an arithmetic number, because the mean of its divisors is an integer number (5303822095).

Almost surely, 2^21022422013 is an apocalyptic number.

It is an amenable number.

21022422013 is a deficient number, since it is larger than the sum of its proper divisors (192866367).

21022422013 is a wasteful number, since it uses less digits than its factorization.

21022422013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192866366.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21022422013 its reverse (31022422012), we get a palindrome (52044844025).

Subtracting 21022422013 from its reverse (31022422012), we obtain a palindrome (9999999999).

The spelling of 21022422013 in words is "twenty-one billion, twenty-two million, four hundred twenty-two thousand, thirteen".