21529068 has 48 divisors (see below), whose sum is σ = 56090496. Its totient is φ = 6370560.

The previous prime is 21529063. The next prime is 21529069. The reversal of 21529068 is 86092512.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21529061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3780 + ... + 7572.

It is an arithmetic number, because the mean of its divisors is an integer number (1168552).

Almost surely, 2^21529068 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 21529068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28045248).

21529068 is an abundant number, since it is smaller than the sum of its proper divisors (34561428).

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

21529068 is a wasteful number, since it uses less digits than its factorization.

21529068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3854 (or 3852 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 21529068 is about 4639.9426720596. The cubic root of 21529068 is about 278.1901464697.

The spelling of 21529068 in words is "twenty-one million, five hundred twenty-nine thousand, sixty-eight".