203231120232221 has 2 divisors, whose sum is σ = 203231120232222. Its totient is φ = 203231120232220.

The previous prime is 203231120232209. The next prime is 203231120232223. The reversal of 203231120232221 is 122232021132302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123996821368996 + 79234298863225 = 11135386^2 + 8901365^2 .

It is a cyclic number.

It is not a de Polignac number, because 203231120232221 - 2¹⁸ = 203231119970077 is a prime.

Together with 203231120232223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203231120232223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101615560116110 + 101615560116111.

It is an arithmetic number, because the mean of its divisors is an integer number (101615560116111).

Almost surely, 2^{203231120232221} is an apocalyptic number.

It is an amenable number.

203231120232221 is a deficient number, since it is larger than the sum of its proper divisors (1).

203231120232221 is an equidigital number, since it uses as much as digits as its factorization.

203231120232221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 203231120232221 its reverse (122232021132302), we get a palindrome (325463141364523).

The spelling of 203231120232221 in words is "two hundred three trillion, two hundred thirty-one billion, one hundred twenty million, two hundred thirty-two thousand, two hundred twenty-one".