16445035421 has 4 divisors (see below), whose sum is σ = 16445292000. Its totient is φ = 16444778844.

The previous prime is 16445035417. The next prime is 16445035427. The reversal of 16445035421 is 12453054461.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16445035421 - 2² = 16445035417 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 (16445035427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58730 + ... + 190628.

It is an arithmetic number, because the mean of its divisors is an integer number (4111323000).

Almost surely, 2^16445035421 is an apocalyptic number.

It is an amenable number.

16445035421 is a deficient number, since it is larger than the sum of its proper divisors (256579).

16445035421 is a wasteful number, since it uses less digits than its factorization.

16445035421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256578.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 16445035421 its reverse (12453054461), we get a palindrome (28898089882).

The spelling of 16445035421 in words is "sixteen billion, four hundred forty-five million, thirty-five thousand, four hundred twenty-one".