21010126 has 16 divisors (see below), whose sum is σ = 32664960. Its totient is φ = 10124640.

The previous prime is 21010111. The next prime is 21010127. The reversal of 21010126 is 62101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19120 + ... + 20188.

It is an arithmetic number, because the mean of its divisors is an integer number (2041560).

Almost surely, 2^21010126 is an apocalyptic number.

21010126 is a deficient number, since it is larger than the sum of its proper divisors (11654834).

21010126 is a wasteful number, since it uses less digits than its factorization.

21010126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21010126 is about 4583.6803989807. The cubic root of 21010126 is about 275.9367547446.

Adding to 21010126 its reverse (62101012), we get a palindrome (83111138).

The spelling of 21010126 in words is "twenty-one million, ten thousand, one hundred twenty-six".