21030102111 has 4 divisors (see below), whose sum is σ = 28040136152. Its totient is φ = 14020068072.

The previous prime is 21030102097. The next prime is 21030102211. The reversal of 21030102111 is 11120103012.

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

It is not a de Polignac number, because 21030102111 - 2⁶ = 21030102047 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 (21030102011) 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, 3505017016 + ... + 3505017021.

It is an arithmetic number, because the mean of its divisors is an integer number (7010034038).

Almost surely, 2^21030102111 is an apocalyptic number.

21030102111 is a deficient number, since it is larger than the sum of its proper divisors (7010034041).

21030102111 is an equidigital number, since it uses as much as digits as its factorization.

21030102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010034040.

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

Adding to 21030102111 its reverse (11120103012), we get a palindrome (32150205123).

Subtracting from 21030102111 its reverse (11120103012), we obtain a palindrome (9909999099).

The spelling of 21030102111 in words is "twenty-one billion, thirty million, one hundred two thousand, one hundred eleven".