21634126 has 16 divisors (see below), whose sum is σ = 33187968. Its totient is φ = 10574200.

The previous prime is 21634121. The next prime is 21634127. The reversal of 21634126 is 62143612.

It is a self number, because there is not a number n which added to its sum of digits gives 21634126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634121) 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, 18021 + ... + 19183.

It is an arithmetic number, because the mean of its divisors is an integer number (2074248).

Almost surely, 2^21634126 is an apocalyptic number.

21634126 is the 2326-th decagonal number.

21634126 is a deficient number, since it is larger than the sum of its proper divisors (11553842).

21634126 is a wasteful number, since it uses less digits than its factorization.

21634126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367.

The product of its digits is 1728, while the sum is 25.

The square root of 21634126 is about 4651.2499395324. The cubic root of 21634126 is about 278.6419184567.

Adding to 21634126 its reverse (62143612), we get a palindrome (83777738).

The spelling of 21634126 in words is "twenty-one million, six hundred thirty-four thousand, one hundred twenty-six".