21352180 has 24 divisors (see below), whose sum is σ = 46287360. Its totient is φ = 8265120.

The previous prime is 21352139. The next prime is 21352183. The reversal of 21352180 is 8125312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352183) 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, 16600 + ... + 17839.

It is an arithmetic number, because the mean of its divisors is an integer number (1928640).

Almost surely, 2^21352180 is an apocalyptic number.

21352180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21352180 is an abundant number, since it is smaller than the sum of its proper divisors (24935180).

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

21352180 is a wasteful number, since it uses less digits than its factorization.

21352180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34479 (or 34477 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21352180 is about 4620.8419146298. The cubic root of 21352180 is about 277.4261578814.

Adding to 21352180 its reverse (8125312), we get a palindrome (29477492).

The spelling of 21352180 in words is "twenty-one million, three hundred fifty-two thousand, one hundred eighty".