16221210 has 32 divisors (see below), whose sum is σ = 40625280. Its totient is φ = 4137408.

The previous prime is 16221203. The next prime is 16221217. The reversal of 16221210 is 1212261.

16221210 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16221203) and next prime (16221217).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 16221210.

It is not an unprimeable number, because it can be changed into a prime (16221217) 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, 11065 + ... + 12444.

It is an arithmetic number, because the mean of its divisors is an integer number (1269540).

Almost surely, 2^16221210 is an apocalyptic number.

16221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16221210 is an abundant number, since it is smaller than the sum of its proper divisors (24404070).

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

16221210 is a wasteful number, since it uses less digits than its factorization.

16221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23542.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 16221210 is about 4027.5563310772. The cubic root of 16221210 is about 253.1401786356.

Adding to 16221210 its reverse (1212261), we get a palindrome (17433471).

The spelling of 16221210 in words is "sixteen million, two hundred twenty-one thousand, two hundred ten".