16422231617521 has 4 divisors (see below), whose sum is σ = 17136241687872. Its totient is φ = 15708221547172.

The previous prime is 16422231617507. The next prime is 16422231617579. The reversal of 16422231617521 is 12571613222461.

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 16422231617521 - 2²⁹ = 16421694746609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16422231617021) 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, 357005035141 + ... + 357005035186.

It is an arithmetic number, because the mean of its divisors is an integer number (4284060421968).

Almost surely, 2^{16422231617521} is an apocalyptic number.

It is an amenable number.

16422231617521 is a deficient number, since it is larger than the sum of its proper divisors (714010070351).

16422231617521 is an equidigital number, since it uses as much as digits as its factorization.

16422231617521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714010070350.

The product of its digits is 241920, while the sum is 43.

Adding to 16422231617521 its reverse (12571613222461), we get a palindrome (28993844839982).

The spelling of 16422231617521 in words is "sixteen trillion, four hundred twenty-two billion, two hundred thirty-one million, six hundred seventeen thousand, five hundred twenty-one".