21320223111 has 30 divisors (see below), whose sum is σ = 35007296016. Its totient is φ = 12921341400.

The previous prime is 21320223097. The next prime is 21320223131. The reversal of 21320223111 is 11132202312.

It is not a de Polignac number, because 21320223111 - 2²⁵ = 21286668679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320223131) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1077855 + ... + 1097456.

Almost surely, 2^21320223111 is an apocalyptic number.

21320223111 is a deficient number, since it is larger than the sum of its proper divisors (13687072905).

21320223111 is a wasteful number, since it uses less digits than its factorization.

21320223111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175345 (or 2175325 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21320223111 its reverse (11132202312), we get a palindrome (32452425423).

The spelling of 21320223111 in words is "twenty-one billion, three hundred twenty million, two hundred twenty-three thousand, one hundred eleven".