20212230421 has 4 divisors (see below), whose sum is σ = 21091023072. Its totient is φ = 19333437772.

The previous prime is 20212230413. The next prime is 20212230431. The reversal of 20212230421 is 12403221202.

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 20212230421 - 2³ = 20212230413 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 (20212230431) 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, 439396291 + ... + 439396336.

It is an arithmetic number, because the mean of its divisors is an integer number (5272755768).

Almost surely, 2^20212230421 is an apocalyptic number.

It is an amenable number.

20212230421 is a deficient number, since it is larger than the sum of its proper divisors (878792651).

20212230421 is an equidigital number, since it uses as much as digits as its factorization.

20212230421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878792650.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20212230421 its reverse (12403221202), we get a palindrome (32615451623).

The spelling of 20212230421 in words is "twenty billion, two hundred twelve million, two hundred thirty thousand, four hundred twenty-one".