203203120312021 has 2 divisors, whose sum is σ = 203203120312022. Its totient is φ = 203203120312020.

The previous prime is 203203120311943. The next prime is 203203120312043. The reversal of 203203120312021 is 120213021302302.

It is an a-pointer prime, because the next prime (203203120312043) can be obtained adding 203203120312021 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153523375107025 + 49679745204996 = 12390455^2 + 7048386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203203120312021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203203120311983 and 203203120312001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203203120312091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101601560156010 + 101601560156011.

It is an arithmetic number, because the mean of its divisors is an integer number (101601560156011).

Almost surely, 2^{203203120312021} is an apocalyptic number.

It is an amenable number.

203203120312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203203120312021 is an equidigital number, since it uses as much as digits as its factorization.

203203120312021 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 22.

Adding to 203203120312021 its reverse (120213021302302), we get a palindrome (323416141614323).

The spelling of 203203120312021 in words is "two hundred three trillion, two hundred three billion, one hundred twenty million, three hundred twelve thousand, twenty-one".