21102013111 has 8 divisors (see below), whose sum is σ = 22215191600. Its totient is φ = 19989089280.

The previous prime is 21102013103. The next prime is 21102013157. The reversal of 21102013111 is 11131020112.

It is a happy number.

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 21102013111 - 2³ = 21102013103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102013091 and 21102013100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102013211) 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, 120055 + ... + 237943.

It is an arithmetic number, because the mean of its divisors is an integer number (2776898950).

Almost surely, 2^21102013111 is an apocalyptic number.

21102013111 is a deficient number, since it is larger than the sum of its proper divisors (1113178489).

21102013111 is a wasteful number, since it uses less digits than its factorization.

21102013111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127329.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21102013111 its reverse (11131020112), we get a palindrome (32233033223).

The spelling of 21102013111 in words is "twenty-one billion, one hundred two million, thirteen thousand, one hundred eleven".