16221005411720 has 32 divisors (see below), whose sum is σ = 36613866876120. Its totient is φ = 6467672440320.

The previous prime is 16221005411701. The next prime is 16221005411761. The reversal of 16221005411720 is 2711450012261.

It can be written as a sum of positive squares in 4 ways, for example, as 3581942330404 + 12639063081316 = 1892602^2 + 3555146^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647791211 + ... + 647816250.

Almost surely, 2^{16221005411720} is an apocalyptic number.

16221005411720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16221005411720 is an abundant number, since it is smaller than the sum of its proper divisors (20392861464400).

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

16221005411720 is a wasteful number, since it uses less digits than its factorization.

16221005411720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295607785 (or 1295607781 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

Adding to 16221005411720 its reverse (2711450012261), we get a palindrome (18932455423981).

The spelling of 16221005411720 in words is "sixteen trillion, two hundred twenty-one billion, five million, four hundred eleven thousand, seven hundred twenty".