21189060 has 48 divisors (see below), whose sum is σ = 65923200. Its totient is φ = 5650272.

The previous prime is 21189041. The next prime is 21189071. The reversal of 21189060 is 6098112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19080 + ... + 20159.

It is an arithmetic number, because the mean of its divisors is an integer number (1373400).

Almost surely, 2^21189060 is an apocalyptic number.

21189060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21189060 is an abundant number, since it is smaller than the sum of its proper divisors (44734140).

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

21189060 is a wasteful number, since it uses less digits than its factorization.

21189060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39257 (or 39249 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 21189060 is about 4603.1576119008. The cubic root of 21189060 is about 276.7178853901.

The spelling of 21189060 in words is "twenty-one million, one hundred eighty-nine thousand, sixty".