16445465421 has 16 divisors (see below), whose sum is σ = 27337916928. Its totient is φ = 8543098800.

The previous prime is 16445465419. The next prime is 16445465429. The reversal of 16445465421 is 12456454461.

It is a happy number.

It is not a de Polignac number, because 16445465421 - 2¹ = 16445465419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16445465429) 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 15 ways as a sum of consecutive naturals, for example, 35596015 + ... + 35596476.

It is an arithmetic number, because the mean of its divisors is an integer number (1708619808).

Almost surely, 2^16445465421 is an apocalyptic number.

16445465421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16445465421 is a deficient number, since it is larger than the sum of its proper divisors (10892451507).

16445465421 is a wasteful number, since it uses less digits than its factorization.

16445465421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71192512.

The product of its digits is 460800, while the sum is 42.

The spelling of 16445465421 in words is "sixteen billion, four hundred forty-five million, four hundred sixty-five thousand, four hundred twenty-one".