21301634 has 16 divisors (see below), whose sum is σ = 33471360. Its totient is φ = 10148160.

The previous prime is 21301613. The next prime is 21301691. The reversal of 21301634 is 43610312.

It is a super-2 number, since 2×21301634² = 907519222139912, which contains 22 as substring.

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, 13562 + ... + 15050.

It is an arithmetic number, because the mean of its divisors is an integer number (2091960).

Almost surely, 2^21301634 is an apocalyptic number.

21301634 is a deficient number, since it is larger than the sum of its proper divisors (12169726).

21301634 is a wasteful number, since it uses less digits than its factorization.

21301634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21301634 is about 4615.3693243336. The cubic root of 21301634 is about 277.2070723312.

Adding to 21301634 its reverse (43610312), we get a palindrome (64911946).

The spelling of 21301634 in words is "twenty-one million, three hundred one thousand, six hundred thirty-four".