21514688 has 56 divisors (see below), whose sum is σ = 48432720. Its totient is φ = 9400320.

The previous prime is 21514687. The next prime is 21514721. The reversal of 21514688 is 88641512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15128 + ... + 16488.

It is an arithmetic number, because the mean of its divisors is an integer number (864870).

Almost surely, 2^21514688 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 21514688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24216360).

21514688 is an abundant number, since it is smaller than the sum of its proper divisors (26918032).

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

21514688 is a wasteful number, since it uses less digits than its factorization.

21514688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405 (or 1395 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 21514688 is about 4638.3928251066. The cubic root of 21514688 is about 278.1281951070.

The spelling of 21514688 in words is "twenty-one million, five hundred fourteen thousand, six hundred eighty-eight".