21110052 has 12 divisors (see below), whose sum is σ = 49256816. Its totient is φ = 7036680.

The previous prime is 21110051. The next prime is 21110071. The reversal of 21110052 is 25001112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21110052³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1759171 = 21110052 / (2 + 1 + 1 + 1 + 0 + 0 + 5 + 2).

It is not an unprimeable number, because it can be changed into a prime (21110051) 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, 879574 + ... + 879597.

Almost surely, 2^21110052 is an apocalyptic number.

It is an amenable number.

21110052 is an abundant number, since it is smaller than the sum of its proper divisors (28146764).

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

21110052 is a wasteful number, since it uses less digits than its factorization.

21110052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759178 (or 1759176 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 21110052 is about 4594.5676619242. The cubic root of 21110052 is about 276.3735228327.

Adding to 21110052 its reverse (25001112), we get a palindrome (46111164).

The spelling of 21110052 in words is "twenty-one million, one hundred ten thousand, fifty-two".