203312221013021 has 2 divisors, whose sum is σ = 203312221013022. Its totient is φ = 203312221013020.

The previous prime is 203312221012937. The next prime is 203312221013039. The reversal of 203312221013021 is 120310122213302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194710934500996 + 8601286512025 = 13953886^2 + 2932795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203312221013021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203312221013081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101656110506510 + 101656110506511.

It is an arithmetic number, because the mean of its divisors is an integer number (101656110506511).

Almost surely, 2^{203312221013021} is an apocalyptic number.

It is an amenable number.

203312221013021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203312221013021 is an equidigital number, since it uses as much as digits as its factorization.

203312221013021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 203312221013021 its reverse (120310122213302), we get a palindrome (323622343226323).

The spelling of 203312221013021 in words is "two hundred three trillion, three hundred twelve billion, two hundred twenty-one million, thirteen thousand, twenty-one".