21011322111323 has 4 divisors (see below), whose sum is σ = 21011335051560. Its totient is φ = 21011309171088.

The previous prime is 21011322111317. The next prime is 21011322111341. The reversal of 21011322111323 is 32311122311012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21011322111323 - 2²⁰ = 21011321062747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011322111623) 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, 3614393 + ... + 7422026.

It is an arithmetic number, because the mean of its divisors is an integer number (5252833762890).

Almost surely, 2^{21011322111323} is an apocalyptic number.

21011322111323 is a deficient number, since it is larger than the sum of its proper divisors (12940237).

21011322111323 is a wasteful number, since it uses less digits than its factorization.

21011322111323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12940236.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21011322111323 its reverse (32311122311012), we get a palindrome (53322444422335).

The spelling of 21011322111323 in words is "twenty-one trillion, eleven billion, three hundred twenty-two million, one hundred eleven thousand, three hundred twenty-three".