21086060 has 12 divisors (see below), whose sum is σ = 44280768. Its totient is φ = 8434416.

The previous prime is 21086027. The next prime is 21086089. The reversal of 21086060 is 6068012.

21086060 = 1620² + 1621² + ... + 1627².

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527132 + ... + 527171.

It is an arithmetic number, because the mean of its divisors is an integer number (3690064).

Almost surely, 2^21086060 is an apocalyptic number.

21086060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21086060 is an abundant number, since it is smaller than the sum of its proper divisors (23194708).

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

21086060 is a wasteful number, since it uses less digits than its factorization.

21086060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054312 (or 1054310 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21086060 is about 4591.9560102423. The cubic root of 21086060 is about 276.2687817810.

The spelling of 21086060 in words is "twenty-one million, eighty-six thousand, sixty".