21307134 has 16 divisors (see below), whose sum is σ = 43094160. Its totient is φ = 7022400.

The previous prime is 21307133. The next prime is 21307183. The reversal of 21307134 is 43170312.

It is a self number, because there is not a number n which added to its sum of digits gives 21307134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21307133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19417 + ... + 20484.

It is an arithmetic number, because the mean of its divisors is an integer number (2693385).

Almost surely, 2^21307134 is an apocalyptic number.

21307134 is an abundant number, since it is smaller than the sum of its proper divisors (21787026).

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

21307134 is a wasteful number, since it uses less digits than its factorization.

21307134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39995.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21307134 is about 4615.9651211854. The cubic root of 21307134 is about 277.2309282116.

Adding to 21307134 its reverse (43170312), we get a palindrome (64477446).

The spelling of 21307134 in words is "twenty-one million, three hundred seven thousand, one hundred thirty-four".