20202443421 has 4 divisors (see below), whose sum is σ = 26936591232. Its totient is φ = 13468295612.

The previous prime is 20202443411. The next prime is 20202443441. The reversal of 20202443421 is 12434420202.

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 20202443421 - 2²⁷ = 20068225693 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20202443391 and 20202443400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202443411) 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, 3367073901 + ... + 3367073906.

It is an arithmetic number, because the mean of its divisors is an integer number (6734147808).

Almost surely, 2^20202443421 is an apocalyptic number.

It is an amenable number.

20202443421 is a deficient number, since it is larger than the sum of its proper divisors (6734147811).

20202443421 is an equidigital number, since it uses as much as digits as its factorization.

20202443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6734147810.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20202443421 its reverse (12434420202), we get a palindrome (32636863623).

The spelling of 20202443421 in words is "twenty billion, two hundred two million, four hundred forty-three thousand, four hundred twenty-one".