21011320013223 has 8 divisors (see below), whose sum is σ = 28398861753328. Its totient is φ = 13815662474304.

The previous prime is 21011320013221. The next prime is 21011320013351. The reversal of 21011320013223 is 32231002311012.

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

It is not a de Polignac number, because 21011320013223 - 2¹ = 21011320013221 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 21011320013223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011320013221) 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, 47971050040 + ... + 47971050477.

It is an arithmetic number, because the mean of its divisors is an integer number (3549857719166).

Almost surely, 2^{21011320013223} is an apocalyptic number.

21011320013223 is a deficient number, since it is larger than the sum of its proper divisors (7387541740105).

21011320013223 is an equidigital number, since it uses as much as digits as its factorization.

21011320013223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95942100593.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21011320013223 its reverse (32231002311012), we get a palindrome (53242322324235).

The spelling of 21011320013223 in words is "twenty-one trillion, eleven billion, three hundred twenty million, thirteen thousand, two hundred twenty-three".