21537068 has 18 divisors (see below), whose sum is σ = 43843716. Its totient is φ = 9230088.

The previous prime is 21537049. The next prime is 21537073. The reversal of 21537068 is 86073512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54746 + ... + 55137.

It is an arithmetic number, because the mean of its divisors is an integer number (2435762).

Almost surely, 2^21537068 is an apocalyptic number.

21537068 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21537068 is an abundant number, since it is smaller than the sum of its proper divisors (22306648).

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

21537068 is a wasteful number, since it uses less digits than its factorization.

21537068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109901 (or 109892 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21537068 is about 4640.8046716060. The cubic root of 21537068 is about 278.2245998200.

The spelling of 21537068 in words is "twenty-one million, five hundred thirty-seven thousand, sixty-eight".