21036126 has 16 divisors (see below), whose sum is σ = 42117264. Its totient is φ = 7004544.

The previous prime is 21036083. The next prime is 21036131. The reversal of 21036126 is 62163012.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9676 + ... + 11648.

It is an arithmetic number, because the mean of its divisors is an integer number (2632329).

Almost surely, 2^21036126 is an apocalyptic number.

21036126 is an abundant number, since it is smaller than the sum of its proper divisors (21081138).

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

21036126 is a wasteful number, since it uses less digits than its factorization.

21036126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21036126 is about 4586.5156709642. The cubic root of 21036126 is about 276.0505316006.

Adding to 21036126 its reverse (62163012), we get a palindrome (83199138).

The spelling of 21036126 in words is "twenty-one million, thirty-six thousand, one hundred twenty-six".