21350210 has 64 divisors (see below), whose sum is σ = 46656000. Its totient is φ = 6876672.

The previous prime is 21350201. The next prime is 21350213. The reversal of 21350210 is 1205312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21350213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143216 + ... + 143364.

It is an arithmetic number, because the mean of its divisors is an integer number (729000).

Almost surely, 2^21350210 is an apocalyptic number.

21350210 is an abundant number, since it is smaller than the sum of its proper divisors (25305790).

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

21350210 is a wasteful number, since it uses less digits than its factorization.

21350210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21350210 is about 4620.6287450952. The cubic root of 21350210 is about 277.4176256326.

Adding to 21350210 its reverse (1205312), we get a palindrome (22555522).

The spelling of 21350210 in words is "twenty-one million, three hundred fifty thousand, two hundred ten".