16421210 has 16 divisors (see below), whose sum is σ = 31832136. Its totient is φ = 6063168.

The previous prime is 16421203. The next prime is 16421213. The reversal of 16421210 is 1212461.

It can be written as a sum of positive squares in 4 ways, for example, as 6315169 + 10106041 = 2513^2 + 3179^2 .

It is a super-2 number, since 2×16421210² = 539312275728200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16421213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63029 + ... + 63288.

Almost surely, 2^16421210 is an apocalyptic number.

16421210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16421210 is a deficient number, since it is larger than the sum of its proper divisors (15410926).

16421210 is a wasteful number, since it uses less digits than its factorization.

16421210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126337.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 16421210 is about 4052.3092182113. The cubic root of 16421210 is about 254.1762989571.

Adding to 16421210 its reverse (1212461), we get a palindrome (17633671).

The spelling of 16421210 in words is "sixteen million, four hundred twenty-one thousand, two hundred ten".