21060180 has 72 divisors (see below), whose sum is σ = 66673152. Its totient is φ = 5370816.

The previous prime is 21060173. The next prime is 21060181. The reversal of 21060180 is 8106012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1597 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (926016).

Almost surely, 2^21060180 is an apocalyptic number.

21060180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21060180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33336576).

21060180 is an abundant number, since it is smaller than the sum of its proper divisors (45612972).

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

21060180 is a wasteful number, since it uses less digits than its factorization.

21060180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125 (or 5120 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 21060180 is about 4589.1371738051. The cubic root of 21060180 is about 276.1557092394.

Adding to 21060180 its reverse (8106012), we get a palindrome (29166192).

It can be divided in two parts, 210601 and 80, that added together give a square (210681 = 459²).

The spelling of 21060180 in words is "twenty-one million, sixty thousand, one hundred eighty".