1021201221121 has 2 divisors, whose sum is σ = 1021201221122. Its totient is φ = 1021201221120.

The previous prime is 1021201221113. The next prime is 1021201221149. The reversal of 1021201221121 is 1211221021201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 774331361521 + 246869859600 = 879961^2 + 496860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021201221121 - 2³ = 1021201221113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021201221095 and 1021201221104.

It is not a weakly prime, because it can be changed into another prime (1021201221421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510600610560 + 510600610561.

It is an arithmetic number, because the mean of its divisors is an integer number (510600610561).

Almost surely, 2^{1021201221121} is an apocalyptic number.

It is an amenable number.

1021201221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021201221121 is an equidigital number, since it uses as much as digits as its factorization.

1021201221121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1021201221121 its reverse (1211221021201), we get a palindrome (2232422242322).

The spelling of 1021201221121 in words is "one trillion, twenty-one billion, two hundred one million, two hundred twenty-one thousand, one hundred twenty-one".