21334441013 has 4 divisors (see below), whose sum is σ = 21830590848. Its totient is φ = 20838291180.

The previous prime is 21334440961. The next prime is 21334441043. The reversal of 21334441013 is 31014443312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21334441013 - 2⁶ = 21334440949 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 (21334441043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248074853 + ... + 248074938.

It is an arithmetic number, because the mean of its divisors is an integer number (5457647712).

Almost surely, 2^21334441013 is an apocalyptic number.

It is an amenable number.

21334441013 is a deficient number, since it is larger than the sum of its proper divisors (496149835).

21334441013 is an equidigital number, since it uses as much as digits as its factorization.

21334441013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496149834.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21334441013 its reverse (31014443312), we get a palindrome (52348884325).

The spelling of 21334441013 in words is "twenty-one billion, three hundred thirty-four million, four hundred forty-one thousand, thirteen".