21325210 has 16 divisors (see below), whose sum is σ = 39624192. Its totient is φ = 8254800.

The previous prime is 21325189. The next prime is 21325217. The reversal of 21325210 is 1252312.

It is not an unprimeable number, because it can be changed into a prime (21325217) 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, 34086 + ... + 34705.

It is an arithmetic number, because the mean of its divisors is an integer number (2476512).

Almost surely, 2^21325210 is an apocalyptic number.

21325210 is a deficient number, since it is larger than the sum of its proper divisors (18298982).

21325210 is a wasteful number, since it uses less digits than its factorization.

21325210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68829.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21325210 is about 4617.9226931598. The cubic root of 21325210 is about 277.3093027415.

Adding to 21325210 its reverse (1252312), we get a palindrome (22577522).

The spelling of 21325210 in words is "twenty-one million, three hundred twenty-five thousand, two hundred ten".