20421214241 has 2 divisors, whose sum is σ = 20421214242. Its totient is φ = 20421214240.

The previous prime is 20421214213. The next prime is 20421214243. The reversal of 20421214241 is 14241212402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19751491600 + 669722641 = 140540^2 + 25879^2 .

It is a cyclic number.

It is not a de Polignac number, because 20421214241 - 2²⁶ = 20354105377 is a prime.

Together with 20421214243, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20421214243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210607120 + 10210607121.

It is an arithmetic number, because the mean of its divisors is an integer number (10210607121).

Almost surely, 2^20421214241 is an apocalyptic number.

It is an amenable number.

20421214241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421214241 is an equidigital number, since it uses as much as digits as its factorization.

20421214241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 20421214241 its reverse (14241212402), we get a palindrome (34662426643).

The spelling of 20421214241 in words is "twenty billion, four hundred twenty-one million, two hundred fourteen thousand, two hundred forty-one".