21252102 has 16 divisors (see below), whose sum is σ = 42554160. Its totient is φ = 7075712.

The previous prime is 21252079. The next prime is 21252107. The reversal of 21252102 is 20125212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252107) by changing a digit.

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, 5674 + ... + 8642.

It is an arithmetic number, because the mean of its divisors is an integer number (2659635).

Almost surely, 2^21252102 is an apocalyptic number.

21252102 is an abundant number, since it is smaller than the sum of its proper divisors (21302058).

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

21252102 is a wasteful number, since it uses less digits than its factorization.

21252102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21252102 is about 4610.0002169197. Note that the first 3 decimals coincide. The cubic root of 21252102 is about 276.9920453693.

Adding to 21252102 its reverse (20125212), we get a palindrome (41377314).

It can be divided in two parts, 2125210 and 2, that added together give a palindrome (2125212).

The spelling of 21252102 in words is "twenty-one million, two hundred fifty-two thousand, one hundred two".