20122417503521 has 4 divisors (see below), whose sum is σ = 20162742990000. Its totient is φ = 20082092017044.

The previous prime is 20122417503509. The next prime is 20122417503523. The reversal of 20122417503521 is 12530571422102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20122417503521 - 2³⁰ = 20121343761697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20122417503523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20162742491 + ... + 20162743488.

It is an arithmetic number, because the mean of its divisors is an integer number (5040685747500).

Almost surely, 2^{20122417503521} is an apocalyptic number.

It is an amenable number.

20122417503521 is a deficient number, since it is larger than the sum of its proper divisors (40325486479).

20122417503521 is an equidigital number, since it uses as much as digits as its factorization.

20122417503521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40325486478.

The product of its (nonzero) digits is 33600, while the sum is 35.

Adding to 20122417503521 its reverse (12530571422102), we get a palindrome (32652988925623).

The spelling of 20122417503521 in words is "twenty trillion, one hundred twenty-two billion, four hundred seventeen million, five hundred three thousand, five hundred twenty-one".