16221562421210 has 16 divisors (see below), whose sum is σ = 29367591623496. Its totient is φ = 6451118465088.

The previous prime is 16221562421191. The next prime is 16221562421219. The reversal of 16221562421210 is 1212426512261.

It can be written as a sum of positive squares in 4 ways, for example, as 14883322967881 + 1338239453329 = 3857891^2 + 1156823^2 .

It is not an unprimeable number, because it can be changed into a prime (16221562421219) 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, 4688311109 + ... + 4688314568.

Almost surely, 2^{16221562421210} is an apocalyptic number.

16221562421210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16221562421210 is a deficient number, since it is larger than the sum of its proper divisors (13146029202286).

16221562421210 is a wasteful number, since it uses less digits than its factorization.

16221562421210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9376625857.

The product of its (nonzero) digits is 23040, while the sum is 35.

Adding to 16221562421210 its reverse (1212426512261), we get a palindrome (17433988933471).

The spelling of 16221562421210 in words is "sixteen trillion, two hundred twenty-one billion, five hundred sixty-two million, four hundred twenty-one thousand, two hundred ten".