21302134 has 16 divisors (see below), whose sum is σ = 36684288. Its totient is φ = 9087912.

The previous prime is 21302129. The next prime is 21302143. The reversal of 21302134 is 43120312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174 + ... + 6529.

It is an arithmetic number, because the mean of its divisors is an integer number (2292768).

Almost surely, 2^21302134 is an apocalyptic number.

21302134 is a deficient number, since it is larger than the sum of its proper divisors (15382154).

21302134 is a wasteful number, since it uses less digits than its factorization.

21302134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6939.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21302134 is about 4615.4234908619. The cubic root of 21302134 is about 277.2092412173.

Adding to 21302134 its reverse (43120312), we get a palindrome (64422446).

The spelling of 21302134 in words is "twenty-one million, three hundred two thousand, one hundred thirty-four".