21200126 has 8 divisors (see below), whose sum is σ = 32128320. Its totient is φ = 10490688.

The previous prime is 21200117. The next prime is 21200129. The reversal of 21200126 is 62100212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21200126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200129) 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, 54446 + ... + 54833.

It is an arithmetic number, because the mean of its divisors is an integer number (4016040).

Almost surely, 2^21200126 is an apocalyptic number.

21200126 is a deficient number, since it is larger than the sum of its proper divisors (10928194).

21200126 is a wasteful number, since it uses less digits than its factorization.

21200126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109378.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21200126 is about 4604.3594559939. The cubic root of 21200126 is about 276.7660490368.

Adding to 21200126 its reverse (62100212), we get a palindrome (83300338).

The spelling of 21200126 in words is "twenty-one million, two hundred thousand, one hundred twenty-six".