21132210 has 32 divisors (see below), whose sum is σ = 55328832. Its totient is φ = 5122880.

The previous prime is 21132197. The next prime is 21132211. The reversal of 21132210 is 1223112.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (21132211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31689 + ... + 32348.

It is an arithmetic number, because the mean of its divisors is an integer number (1729026).

Almost surely, 2^21132210 is an apocalyptic number.

21132210 is an abundant number, since it is smaller than the sum of its proper divisors (34196622).

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

21132210 is a wasteful number, since it uses less digits than its factorization.

21132210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64058.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21132210 is about 4596.9783553983. The cubic root of 21132210 is about 276.4701867843.

Adding to 21132210 its reverse (1223112), we get a palindrome (22355322).

It can be divided in two parts, 21 and 132210, that added together give a palindrome (132231).

The spelling of 21132210 in words is "twenty-one million, one hundred thirty-two thousand, two hundred ten".