21900134 has 16 divisors (see below), whose sum is σ = 33386496. Its totient is φ = 10773000.

The previous prime is 21900127. The next prime is 21900139. The reversal of 21900134 is 43100912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900139) by changing a digit.

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, 38069 + ... + 38639.

It is an arithmetic number, because the mean of its divisors is an integer number (2086656).

Almost surely, 2^21900134 is an apocalyptic number.

21900134 is a deficient number, since it is larger than the sum of its proper divisors (11486362).

21900134 is a wasteful number, since it uses less digits than its factorization.

21900134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21900134 is about 4679.7578997209. The cubic root of 21900134 is about 279.7793073910.

The spelling of 21900134 in words is "twenty-one million, nine hundred thousand, one hundred thirty-four".