20421202343 has 2 divisors, whose sum is σ = 20421202344. Its totient is φ = 20421202342.

The previous prime is 20421202313. The next prime is 20421202367. The reversal of 20421202343 is 34320212402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20421202343 - 2¹⁰ = 20421201319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20421202313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210601171 + 10210601172.

It is an arithmetic number, because the mean of its divisors is an integer number (10210601172).

Almost surely, 2^20421202343 is an apocalyptic number.

20421202343 is a deficient number, since it is larger than the sum of its proper divisors (1).

20421202343 is an equidigital number, since it uses as much as digits as its factorization.

20421202343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20421202343 its reverse (34320212402), we get a palindrome (54741414745).

The spelling of 20421202343 in words is "twenty billion, four hundred twenty-one million, two hundred two thousand, three hundred forty-three".