203023122221 has 2 divisors, whose sum is σ = 203023122222. Its totient is φ = 203023122220.

The previous prime is 203023122161. The next prime is 203023122241. The reversal of 203023122221 is 122221320302.

It is a happy number.

It is an a-pointer prime, because the next prime (203023122241) can be obtained adding 203023122221 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198586096900 + 4437025321 = 445630^2 + 66611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203023122221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203023122193 and 203023122202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203023122241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101511561110 + 101511561111.

It is an arithmetic number, because the mean of its divisors is an integer number (101511561111).

Almost surely, 2^203023122221 is an apocalyptic number.

It is an amenable number.

203023122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

203023122221 is an equidigital number, since it uses as much as digits as its factorization.

203023122221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 203023122221 its reverse (122221320302), we get a palindrome (325244442523).

The spelling of 203023122221 in words is "two hundred three billion, twenty-three million, one hundred twenty-two thousand, two hundred twenty-one".