21213000111 has 4 divisors (see below), whose sum is σ = 28284000152. Its totient is φ = 14142000072.

The previous prime is 21213000101. The next prime is 21213000113. The reversal of 21213000111 is 11100031212.

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

It is not a de Polignac number, because 21213000111 - 2¹¹ = 21212998063 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 (21213000113) 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, 3535500016 + ... + 3535500021.

It is an arithmetic number, because the mean of its divisors is an integer number (7071000038).

Almost surely, 2^21213000111 is an apocalyptic number.

21213000111 is a deficient number, since it is larger than the sum of its proper divisors (7071000041).

21213000111 is an equidigital number, since it uses as much as digits as its factorization.

21213000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071000040.

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

Adding to 21213000111 its reverse (11100031212), we get a palindrome (32313031323).

The spelling of 21213000111 in words is "twenty-one billion, two hundred thirteen million, one hundred eleven", and thus it is an aban number.