1011203301221 has 2 divisors, whose sum is σ = 1011203301222. Its totient is φ = 1011203301220.

The previous prime is 1011203301209. The next prime is 1011203301223. The reversal of 1011203301221 is 1221033021101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 748484522500 + 262718778721 = 865150^2 + 512561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011203301221 - 2¹⁰ = 1011203300197 is a prime.

It is a super-3 number, since 3×1011203301221³ (a number of 37 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 1011203301223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1011203301221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011203301223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505601650610 + 505601650611.

It is an arithmetic number, because the mean of its divisors is an integer number (505601650611).

Almost surely, 2^{1011203301221} is an apocalyptic number.

It is an amenable number.

1011203301221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011203301221 is an equidigital number, since it uses as much as digits as its factorization.

1011203301221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1011203301221 its reverse (1221033021101), we get a palindrome (2232236322322).

The spelling of 1011203301221 in words is "one trillion, eleven billion, two hundred three million, three hundred one thousand, two hundred twenty-one".