100203103121221 has 2 divisors, whose sum is σ = 100203103121222. Its totient is φ = 100203103121220.

The previous prime is 100203103121201. The next prime is 100203103121227. The reversal of 100203103121221 is 122121301302001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52618905624321 + 47584197496900 = 7253889^2 + 6898130^2 .

It is a cyclic number.

It is not a de Polignac number, because 100203103121221 - 2¹⁵ = 100203103088453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100203103121227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50101551560610 + 50101551560611.

It is an arithmetic number, because the mean of its divisors is an integer number (50101551560611).

Almost surely, 2^{100203103121221} is an apocalyptic number.

It is an amenable number.

100203103121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

100203103121221 is an equidigital number, since it uses as much as digits as its factorization.

100203103121221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 100203103121221 its reverse (122121301302001), we get a palindrome (222324404423222).

The spelling of 100203103121221 in words is "one hundred trillion, two hundred three billion, one hundred three million, one hundred twenty-one thousand, two hundred twenty-one".