20352353430021 has 4 divisors (see below), whose sum is σ = 27136471240032. Its totient is φ = 13568235620012.

The previous prime is 20352353429987. The next prime is 20352353430041. The reversal of 20352353430021 is 12003435325302.

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 20352353430021 - 2³⁰ = 20351279688197 is a prime.

It is a super-4 number, since 4×20352353430021⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20352353430041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3392058905001 + ... + 3392058905006.

It is an arithmetic number, because the mean of its divisors is an integer number (6784117810008).

Almost surely, 2^{20352353430021} is an apocalyptic number.

It is an amenable number.

20352353430021 is a deficient number, since it is larger than the sum of its proper divisors (6784117810011).

20352353430021 is an equidigital number, since it uses as much as digits as its factorization.

20352353430021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6784117810010.

The product of its (nonzero) digits is 64800, while the sum is 33.

Adding to 20352353430021 its reverse (12003435325302), we get a palindrome (32355788755323).

The spelling of 20352353430021 in words is "twenty trillion, three hundred fifty-two billion, three hundred fifty-three million, four hundred thirty thousand, twenty-one".