21113013111 has 4 divisors (see below), whose sum is σ = 28150684152. Its totient is φ = 14075342072.

The previous prime is 21113013101. The next prime is 21113013127. The reversal of 21113013111 is 11131031112.

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

It is a cyclic number.

It is not a de Polignac number, because 21113013111 - 2⁵ = 21113013079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113013101) 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, 3518835516 + ... + 3518835521.

It is an arithmetic number, because the mean of its divisors is an integer number (7037671038).

Almost surely, 2^21113013111 is an apocalyptic number.

21113013111 is a deficient number, since it is larger than the sum of its proper divisors (7037671041).

21113013111 is an equidigital number, since it uses as much as digits as its factorization.

21113013111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037671040.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 21113013111 its reverse (11131031112), we get a palindrome (32244044223).

The spelling of 21113013111 in words is "twenty-one billion, one hundred thirteen million, thirteen thousand, one hundred eleven".