21500163226416 has 80 divisors (see below), whose sum is σ = 63498273350400. Its totient is φ = 6140813362944.

The previous prime is 21500163226393. The next prime is 21500163226609. The reversal of 21500163226416 is 61462236100512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9898611 + ... + 11873618.

It is an arithmetic number, because the mean of its divisors is an integer number (793728416880).

Almost surely, 2^{21500163226416} is an apocalyptic number.

It is an amenable number.

21500163226416 is an abundant number, since it is smaller than the sum of its proper divisors (41998110123984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21500163226416 is a wasteful number, since it uses less digits than its factorization.

21500163226416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21775186 (or 21775180 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 21500163226416 its reverse (61462236100512), we get a palindrome (82962399326928).

The spelling of 21500163226416 in words is "twenty-one trillion, five hundred billion, one hundred sixty-three million, two hundred twenty-six thousand, four hundred sixteen".