21216600363501 has 12 divisors (see below), whose sum is σ = 31781244989312. Its totient is φ = 14144400242172.

The previous prime is 21216600363443. The next prime is 21216600363601. The reversal of 21216600363501 is 10536300661212.

21216600363501 is a `hidden beast` number, since 2 + 1 + 2 + 16 + 6 + 0 + 0 + 3 + 635 + 0 + 1 = 666.

It is not a de Polignac number, because 21216600363501 - 2²⁷ = 21216466145773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216600363601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43655556061 + ... + 43655556546.

Almost surely, 2^{21216600363501} is an apocalyptic number.

It is an amenable number.

21216600363501 is a deficient number, since it is larger than the sum of its proper divisors (10564644625811).

21216600363501 is an frugal number, since it uses more digits than its factorization.

21216600363501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87311112622 (or 87311112610 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 21216600363501 in words is "twenty-one trillion, two hundred sixteen billion, six hundred million, three hundred sixty-three thousand, five hundred one".