21434368 has 26 divisors (see below), whose sum is σ = 42871694. Its totient is φ = 10715136.

The previous prime is 21434353. The next prime is 21434383. The reversal of 21434368 is 86343412.

It is an interprime number because it is at equal distance from previous prime (21434353) and next prime (21434383).

It can be written as a sum of positive squares in only one way, i.e., 21233664 + 200704 = 4608^2 + 448^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1480 + ... + 6712.

Almost surely, 2^21434368 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 21434368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21435847).

21434368 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.

21434368 is an frugal number, since it uses more digits than its factorization.

21434368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257 (or 5235 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 21434368 is about 4629.7265578001. The cubic root of 21434368 is about 277.7816548911.

The spelling of 21434368 in words is "twenty-one million, four hundred thirty-four thousand, three hundred sixty-eight".