21443223013 has 8 divisors (see below), whose sum is σ = 21762334400. Its totient is φ = 21124797408.

The previous prime is 21443222987. The next prime is 21443223017. The reversal of 21443223013 is 31032234412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21443223013 - 2⁹ = 21443222501 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 (21443223017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108273 + ... + 233686.

It is an arithmetic number, because the mean of its divisors is an integer number (2720291800).

Almost surely, 2^21443223013 is an apocalyptic number.

It is an amenable number.

21443223013 is a deficient number, since it is larger than the sum of its proper divisors (319111387).

21443223013 is an equidigital number, since it uses as much as digits as its factorization.

21443223013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342891.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21443223013 its reverse (31032234412), we get a palindrome (52475457425).

The spelling of 21443223013 in words is "twenty-one billion, four hundred forty-three million, two hundred twenty-three thousand, thirteen".