16223457621 has 16 divisors (see below), whose sum is σ = 24757257728. Its totient is φ = 9257122800.

The previous prime is 16223457619. The next prime is 16223457641. The reversal of 16223457621 is 12675432261.

It is not a de Polignac number, because 16223457621 - 2¹ = 16223457619 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 16223457621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16223457611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544495 + ... + 573516.

It is an arithmetic number, because the mean of its divisors is an integer number (1547328608).

Almost surely, 2^16223457621 is an apocalyptic number.

It is an amenable number.

16223457621 is a deficient number, since it is larger than the sum of its proper divisors (8533800107).

16223457621 is a wasteful number, since it uses less digits than its factorization.

16223457621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118712.

The product of its digits is 120960, while the sum is 39.

Adding to 16223457621 its reverse (12675432261), we get a palindrome (28898889882).

The spelling of 16223457621 in words is "sixteen billion, two hundred twenty-three million, four hundred fifty-seven thousand, six hundred twenty-one".