21518893087201 has 8 divisors (see below), whose sum is σ = 22651964203680. Its totient is φ = 20385871750368.

The previous prime is 21518893087199. The next prime is 21518893087217. The reversal of 21518893087201 is 10278039881512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21518893087201 - 2¹ = 21518893087199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21518893087301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11555956 + ... + 13288261.

It is an arithmetic number, because the mean of its divisors is an integer number (2831495525460).

Almost surely, 2^{21518893087201} is an apocalyptic number.

It is an amenable number.

21518893087201 is a deficient number, since it is larger than the sum of its proper divisors (1133071116479).

21518893087201 is a wasteful number, since it uses less digits than its factorization.

21518893087201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24889823.

The product of its (nonzero) digits is 1935360, while the sum is 55.

The spelling of 21518893087201 in words is "twenty-one trillion, five hundred eighteen billion, eight hundred ninety-three million, eighty-seven thousand, two hundred one".