981121022201 has 2 divisors, whose sum is σ = 981121022202. Its totient is φ = 981121022200.

The previous prime is 981121022183. The next prime is 981121022221. The reversal of 981121022201 is 102220121189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 881232787600 + 99888234601 = 938740^2 + 316051^2 .

It is an emirp because it is prime and its reverse (102220121189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981121022201 - 2⁶ = 981121022137 is a prime.

It is not a weakly prime, because it can be changed into another prime (981121022221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490560511100 + 490560511101.

It is an arithmetic number, because the mean of its divisors is an integer number (490560511101).

Almost surely, 2^981121022201 is an apocalyptic number.

It is an amenable number.

981121022201 is a deficient number, since it is larger than the sum of its proper divisors (1).

981121022201 is an equidigital number, since it uses as much as digits as its factorization.

981121022201 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 981121022201 in words is "nine hundred eighty-one billion, one hundred twenty-one million, twenty-two thousand, two hundred one".