16433446121 has 4 divisors (see below), whose sum is σ = 16433708544. Its totient is φ = 16433183700.

The previous prime is 16433446103. The next prime is 16433446129. The reversal of 16433446121 is 12164433461.

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 a de Polignac number, because none of the positive numbers 2^k-16433446121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16433446129) 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, 23636 + ... + 182826.

It is an arithmetic number, because the mean of its divisors is an integer number (4108427136).

Almost surely, 2^16433446121 is an apocalyptic number.

It is an amenable number.

16433446121 is a deficient number, since it is larger than the sum of its proper divisors (262423).

16433446121 is a wasteful number, since it uses less digits than its factorization.

16433446121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262422.

The product of its digits is 41472, while the sum is 35.

Adding to 16433446121 its reverse (12164433461), we get a palindrome (28597879582).

The spelling of 16433446121 in words is "sixteen billion, four hundred thirty-three million, four hundred forty-six thousand, one hundred twenty-one".