21000320111 has 8 divisors (see below), whose sum is σ = 22045171200. Its totient is φ = 19978432920.

The previous prime is 21000320093. The next prime is 21000320137. The reversal of 21000320111 is 11102300012.

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 21000320111 - 2³⁴ = 3820450927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000320092 and 21000320101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000320161) 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, 5739101 + ... + 5742758.

It is an arithmetic number, because the mean of its divisors is an integer number (2755646400).

Almost surely, 2^21000320111 is an apocalyptic number.

21000320111 is a deficient number, since it is larger than the sum of its proper divisors (1044851089).

21000320111 is a wasteful number, since it uses less digits than its factorization.

21000320111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11481949.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21000320111 its reverse (11102300012), we get a palindrome (32102620123).

The spelling of 21000320111 in words is "twenty-one billion, three hundred twenty thousand, one hundred eleven".