21111102 has 24 divisors (see below), whose sum is σ = 47730384. Its totient is φ = 6730944.

The previous prime is 21111073. The next prime is 21111113. The reversal of 21111102 is 20111112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25083 + ... + 25910.

It is an arithmetic number, because the mean of its divisors is an integer number (1988766).

Almost surely, 2^21111102 is an apocalyptic number.

21111102 is an abundant number, since it is smaller than the sum of its proper divisors (26619282).

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

21111102 is a wasteful number, since it uses less digits than its factorization.

21111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51024 (or 51021 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 21111102 is about 4594.6819258791. The cubic root of 21111102 is about 276.3781049687.

Adding to 21111102 its reverse (20111112), we get a palindrome (41222214).

It can be divided in two parts, 2111110 and 2, that added together give a palindrome (2111112).

The spelling of 21111102 in words is "twenty-one million, one hundred eleven thousand, one hundred two".