21371060 has 24 divisors (see below), whose sum is σ = 45056256. Its totient is φ = 8514720.

The previous prime is 21371047. The next prime is 21371069. The reversal of 21371060 is 6017312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3449 + ... + 7391.

It is an arithmetic number, because the mean of its divisors is an integer number (1877344).

Almost surely, 2^21371060 is an apocalyptic number.

21371060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21371060 is an abundant number, since it is smaller than the sum of its proper divisors (23685196).

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

21371060 is a wasteful number, since it uses less digits than its factorization.

21371060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223 (or 4221 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21371060 is about 4622.8843809899. The cubic root of 21371060 is about 277.5079022721.

Adding to 21371060 its reverse (6017312), we get a palindrome (27388372).

The spelling of 21371060 in words is "twenty-one million, three hundred seventy-one thousand, sixty".