203500145101021 has 2 divisors, whose sum is σ = 203500145101022. Its totient is φ = 203500145101020.

The previous prime is 203500145100983. The next prime is 203500145101039. The reversal of 203500145101021 is 120101541005302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194397795760921 + 9102349340100 = 13942661^2 + 3017010^2 .

It is a cyclic number.

It is not a de Polignac number, because 203500145101021 - 2²³ = 203500136712413 is a prime.

It is a super-2 number, since 2×203500145101021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203500145101051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101750072550510 + 101750072550511.

It is an arithmetic number, because the mean of its divisors is an integer number (101750072550511).

Almost surely, 2^{203500145101021} is an apocalyptic number.

It is an amenable number.

203500145101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203500145101021 is an equidigital number, since it uses as much as digits as its factorization.

203500145101021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 203500145101021 its reverse (120101541005302), we get a palindrome (323601686106323).

The spelling of 203500145101021 in words is "two hundred three trillion, five hundred billion, one hundred forty-five million, one hundred one thousand, twenty-one".