21089060 has 24 divisors (see below), whose sum is σ = 44384760. Its totient is φ = 8417024.

The previous prime is 21089051. The next prime is 21089087. The reversal of 21089060 is 6098012.

It can be written as a sum of positive squares in 4 ways, for example, as 495616 + 20593444 = 704^2 + 4538^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11486 + ... + 13194.

It is an arithmetic number, because the mean of its divisors is an integer number (1849365).

Almost surely, 2^21089060 is an apocalyptic number.

21089060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21089060 is an abundant number, since it is smaller than the sum of its proper divisors (23295700).

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

21089060 is a wasteful number, since it uses less digits than its factorization.

21089060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335 (or 2333 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21089060 is about 4592.2826568059. The cubic root of 21089060 is about 276.2818831229.

The spelling of 21089060 in words is "twenty-one million, eighty-nine thousand, sixty".