21520588001 has 8 divisors (see below), whose sum is σ = 23482261344. Its totient is φ = 19559790720.

The previous prime is 21520587973. The next prime is 21520588003. The reversal of 21520588001 is 10088502512.

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 21520588001 - 2³⁰ = 20446846177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21520588003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167111 + ... + 266396.

It is an arithmetic number, because the mean of its divisors is an integer number (2935282668).

Almost surely, 2^21520588001 is an apocalyptic number.

It is an amenable number.

21520588001 is a deficient number, since it is larger than the sum of its proper divisors (1961673343).

21520588001 is a wasteful number, since it uses less digits than its factorization.

21520588001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438031.

The product of its (nonzero) digits is 6400, while the sum is 32.

The spelling of 21520588001 in words is "twenty-one billion, five hundred twenty million, five hundred eighty-eight thousand, one".