21019134 has 8 divisors (see below), whose sum is σ = 42038280. Its totient is φ = 7006376.

The previous prime is 21019129. The next prime is 21019151. The reversal of 21019134 is 43191012.

It is a sphenic number, since it is the product of 3 distinct primes.

21019134 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21019134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1751589 + ... + 1751600.

It is an arithmetic number, because the mean of its divisors is an integer number (5254785).

Almost surely, 2^21019134 is an apocalyptic number.

21019134 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21019134 is a wasteful number, since it uses less digits than its factorization.

21019134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503194.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21019134 is about 4584.6629101822. The cubic root of 21019134 is about 275.9761846706.

The spelling of 21019134 in words is "twenty-one million, nineteen thousand, one hundred thirty-four".