16421058438479 has 4 divisors (see below), whose sum is σ = 16699381462920. Its totient is φ = 16142735414040.

The previous prime is 16421058438359. The next prime is 16421058438481. The reversal of 16421058438479 is 97483485012461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421058438479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16421058438079) 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, 139161512132 + ... + 139161512249.

It is an arithmetic number, because the mean of its divisors is an integer number (4174845365730).

It is a 1-persistent number, because it is pandigital, but 2⋅16421058438479 = 32842116876958 is not.

Almost surely, 2^{16421058438479} is an apocalyptic number.

16421058438479 is a deficient number, since it is larger than the sum of its proper divisors (278323024441).

16421058438479 is an equidigital number, since it uses as much as digits as its factorization.

16421058438479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278323024440.

The product of its (nonzero) digits is 46448640, while the sum is 62.

The spelling of 16421058438479 in words is "sixteen trillion, four hundred twenty-one billion, fifty-eight million, four hundred thirty-eight thousand, four hundred seventy-nine".