16463204542221 has 4 divisors (see below), whose sum is σ = 21950939389632. Its totient is φ = 10975469694812.

The previous prime is 16463204542201. The next prime is 16463204542273. The reversal of 16463204542221 is 12224540236461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16463204542221 - 2⁶ = 16463204542157 is a prime.

It is a super-4 number, since 4×16463204542221⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16463204542201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2743867423701 + ... + 2743867423706.

It is an arithmetic number, because the mean of its divisors is an integer number (5487734847408).

Almost surely, 2^{16463204542221} is an apocalyptic number.

It is an amenable number.

16463204542221 is a deficient number, since it is larger than the sum of its proper divisors (5487734847411).

16463204542221 is an equidigital number, since it uses as much as digits as its factorization.

16463204542221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5487734847410.

The product of its (nonzero) digits is 552960, while the sum is 42.

Adding to 16463204542221 its reverse (12224540236461), we get a palindrome (28687744778682).

The spelling of 16463204542221 in words is "sixteen trillion, four hundred sixty-three billion, two hundred four million, five hundred forty-two thousand, two hundred twenty-one".