21111052 has 24 divisors (see below), whose sum is σ = 39090800. Its totient is φ = 9948096.

The previous prime is 21111049. The next prime is 21111061. The reversal of 21111052 is 25011112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16798 + ... + 18010.

Almost surely, 2^21111052 is an apocalyptic number.

It is an amenable number.

21111052 is a deficient number, since it is larger than the sum of its proper divisors (17979748).

21111052 is a wasteful number, since it uses less digits than its factorization.

21111052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 21111052 is about 4594.6764848028. The cubic root of 21111052 is about 276.3778867751.

Adding to 21111052 its reverse (25011112), we get a palindrome (46122164).

The spelling of 21111052 in words is "twenty-one million, one hundred eleven thousand, fifty-two".