21520353004501 has 8 divisors (see below), whose sum is σ = 23568574347360. Its totient is φ = 19528247314992.

The previous prime is 21520353004429. The next prime is 21520353004511. The reversal of 21520353004501 is 10540035302512.

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

It is not a de Polignac number, because 21520353004501 - 2⁷ = 21520353004373 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 (21520353004511) 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, 14028912535 + ... + 14028914068.

It is an arithmetic number, because the mean of its divisors is an integer number (2946071793420).

Almost surely, 2^{21520353004501} is an apocalyptic number.

It is an amenable number.

21520353004501 is a deficient number, since it is larger than the sum of its proper divisors (2048221342859).

21520353004501 is a wasteful number, since it uses less digits than its factorization.

21520353004501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28057826675.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21520353004501 in words is "twenty-one trillion, five hundred twenty billion, three hundred fifty-three million, four thousand, five hundred one".