21034368 has 144 divisors (see below), whose sum is σ = 65835900. Its totient is φ = 6428160.

The previous prime is 21034357. The next prime is 21034369. The reversal of 21034368 is 86343012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034369) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 678513 + ... + 678543.

Almost surely, 2^21034368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21034368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32917950).

21034368 is an abundant number, since it is smaller than the sum of its proper divisors (44801532).

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

21034368 is a wasteful number, since it uses less digits than its factorization.

21034368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 55 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21034368 is about 4586.3240182089. The cubic root of 21034368 is about 276.0428414908.

The spelling of 21034368 in words is "twenty-one million, thirty-four thousand, three hundred sixty-eight".