16721226224 has 20 divisors (see below), whose sum is σ = 32500891536. Its totient is φ = 8333899392.

The previous prime is 16721226211. The next prime is 16721226229. The reversal of 16721226224 is 42262212761.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721226229) 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, 1664444 + ... + 1674459.

Almost surely, 2^16721226224 is an apocalyptic number.

It is an amenable number.

16721226224 is a deficient number, since it is larger than the sum of its proper divisors (15779665312).

16721226224 is a wasteful number, since it uses less digits than its factorization.

16721226224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3339224 (or 3339218 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

Adding to 16721226224 its reverse (42262212761), we get a palindrome (58983438985).

The spelling of 16721226224 in words is "sixteen billion, seven hundred twenty-one million, two hundred twenty-six thousand, two hundred twenty-four".