16632221521321 has 16 divisors (see below), whose sum is σ = 19445416777600. Its totient is φ = 13931900477568.

The previous prime is 16632221521301. The next prime is 16632221521327. The reversal of 16632221521321 is 12312512223661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16632221521321 - 2⁷ = 16632221521193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16632221521327) 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, 149248791 + ... + 149360188.

It is an arithmetic number, because the mean of its divisors is an integer number (1215338548600).

Almost surely, 2^{16632221521321} is an apocalyptic number.

It is an amenable number.

16632221521321 is a deficient number, since it is larger than the sum of its proper divisors (2813195256279).

16632221521321 is a wasteful number, since it uses less digits than its factorization.

16632221521321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298609168.

The product of its digits is 51840, while the sum is 37.

Adding to 16632221521321 its reverse (12312512223661), we get a palindrome (28944733744982).

The spelling of 16632221521321 in words is "sixteen trillion, six hundred thirty-two billion, two hundred twenty-one million, five hundred twenty-one thousand, three hundred twenty-one".