21111114 has 16 divisors (see below), whose sum is σ = 42436800. Its totient is φ = 7001280.

The previous prime is 21111113. The next prime is 21111143. The reversal of 21111114 is 41111112.

It is a self number, because there is not a number n which added to its sum of digits gives 21111114.

It is not an unprimeable number, because it can be changed into a prime (21111113) 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, 7647 + ... + 10034.

It is an arithmetic number, because the mean of its divisors is an integer number (2652300).

Almost surely, 2^21111114 is an apocalyptic number.

21111114 is an abundant number, since it is smaller than the sum of its proper divisors (21325686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111114 is a wasteful number, since it uses less digits than its factorization.

21111114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17885.

The product of its digits is 8, while the sum is 12.

The square root of 21111114 is about 4594.6832317364. The cubic root of 21111114 is about 276.3781573350.

Adding to 21111114 its reverse (41111112), we get a palindrome (62222226).

It can be divided in two parts, 211 and 11114, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 21111114 in words is "twenty-one million, one hundred eleven thousand, one hundred fourteen".