1021202022121 has 2 divisors, whose sum is σ = 1021202022122. Its totient is φ = 1021202022120.

The previous prime is 1021202022079. The next prime is 1021202022193. The reversal of 1021202022121 is 1212202021201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 973606491225 + 47595530896 = 986715^2 + 218164^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021202022121 - 2⁷ = 1021202021993 is a prime.

It is a super-3 number, since 3×1021202022121³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021202022095 and 1021202022104.

It is not a weakly prime, because it can be changed into another prime (1021202022221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510601011060 + 510601011061.

It is an arithmetic number, because the mean of its divisors is an integer number (510601011061).

Almost surely, 2^{1021202022121} is an apocalyptic number.

It is an amenable number.

1021202022121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021202022121 is an equidigital number, since it uses as much as digits as its factorization.

1021202022121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1021202022121 its reverse (1212202021201), we get a palindrome (2233404043322).

The spelling of 1021202022121 in words is "one trillion, twenty-one billion, two hundred two million, twenty-two thousand, one hundred twenty-one".