21319634 has 16 divisors (see below), whose sum is σ = 38472000. Its totient is φ = 8655984.

The previous prime is 21319633. The next prime is 21319663. The reversal of 21319634 is 43691312.

It is a junction number, because it is equal to n+sod(n) for n = 21319597 and 21319606.

It is not an unprimeable number, because it can be changed into a prime (21319633) 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, 39809 + ... + 40340.

It is an arithmetic number, because the mean of its divisors is an integer number (2404500).

Almost surely, 2^21319634 is an apocalyptic number.

21319634 is a deficient number, since it is larger than the sum of its proper divisors (17152366).

21319634 is a wasteful number, since it uses less digits than its factorization.

21319634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80177.

The product of its digits is 3888, while the sum is 29.

The square root of 21319634 is about 4617.3189190265. The cubic root of 21319634 is about 277.2851308582.

The spelling of 21319634 in words is "twenty-one million, three hundred nineteen thousand, six hundred thirty-four".