20002315421 has 4 divisors (see below), whose sum is σ = 21820707744. Its totient is φ = 18183923100.

The previous prime is 20002315373. The next prime is 20002315439. The reversal of 20002315421 is 12451320002.

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 20002315421 - 2³⁰ = 18928573597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20002315393 and 20002315402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002315121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909196145 + ... + 909196166.

It is an arithmetic number, because the mean of its divisors is an integer number (5455176936).

Almost surely, 2^20002315421 is an apocalyptic number.

It is an amenable number.

20002315421 is a deficient number, since it is larger than the sum of its proper divisors (1818392323).

20002315421 is a wasteful number, since it uses less digits than its factorization.

20002315421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818392322.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20002315421 its reverse (12451320002), we get a palindrome (32453635423).

The spelling of 20002315421 in words is "twenty billion, two million, three hundred fifteen thousand, four hundred twenty-one".