21123052 has 12 divisors (see below), whose sum is σ = 37068640. Its totient is φ = 10532016.

The previous prime is 21123043. The next prime is 21123073. The reversal of 21123052 is 25032112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5727 + ... + 8662.

Almost surely, 2^21123052 is an apocalyptic number.

It is an amenable number.

21123052 is a deficient number, since it is larger than the sum of its proper divisors (15945588).

21123052 is a wasteful number, since it uses less digits than its factorization.

21123052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14760 (or 14758 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21123052 is about 4595.9821583640. The cubic root of 21123052 is about 276.4302433392.

Adding to 21123052 its reverse (25032112), we get a palindrome (46155164).

The spelling of 21123052 in words is "twenty-one million, one hundred twenty-three thousand, fifty-two".