1202002121981 has 2 divisors, whose sum is σ = 1202002121982. Its totient is φ = 1202002121980.

The previous prime is 1202002121953. The next prime is 1202002122011. The reversal of 1202002121981 is 1891212002021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1034561573956 + 167440548025 = 1017134^2 + 409195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202002121981 - 2¹⁴ = 1202002105597 is a prime.

It is a super-2 number, since 2×1202002121981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1202002121581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601001060990 + 601001060991.

It is an arithmetic number, because the mean of its divisors is an integer number (601001060991).

Almost surely, 2^{1202002121981} is an apocalyptic number.

It is an amenable number.

1202002121981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202002121981 is an equidigital number, since it uses as much as digits as its factorization.

1202002121981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 1202002121981 in words is "one trillion, two hundred two billion, two million, one hundred twenty-one thousand, nine hundred eighty-one".