20133223421 has 2 divisors, whose sum is σ = 20133223422. Its totient is φ = 20133223420.

The previous prime is 20133223387. The next prime is 20133223427. The reversal of 20133223421 is 12432233102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18168074521 + 1965148900 = 134789^2 + 44330^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133223421 - 2¹⁴ = 20133207037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20133223427) 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 as a sum of consecutive naturals, namely, 10066611710 + 10066611711.

It is an arithmetic number, because the mean of its divisors is an integer number (10066611711).

Almost surely, 2^20133223421 is an apocalyptic number.

It is an amenable number.

20133223421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133223421 is an equidigital number, since it uses as much as digits as its factorization.

20133223421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20133223421 its reverse (12432233102), we get a palindrome (32565456523).

The spelling of 20133223421 in words is "twenty billion, one hundred thirty-three million, two hundred twenty-three thousand, four hundred twenty-one".