21440060 has 24 divisors (see below), whose sum is σ = 47673360. Its totient is φ = 8071424.

The previous prime is 21440059. The next prime is 21440087. The reversal of 21440060 is 6004412.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

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, 31190 + ... + 31869.

It is an arithmetic number, because the mean of its divisors is an integer number (1986390).

Almost surely, 2^21440060 is an apocalyptic number.

21440060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440060 is an abundant number, since it is smaller than the sum of its proper divisors (26233300).

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

21440060 is a wasteful number, since it uses less digits than its factorization.

21440060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63085 (or 63083 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21440060 is about 4630.3412401247. The cubic root of 21440060 is about 277.8062414684.

Adding to 21440060 its reverse (6004412), we get a palindrome (27444472).

The spelling of 21440060 in words is "twenty-one million, four hundred forty thousand, sixty".