981021220237 has 2 divisors, whose sum is σ = 981021220238. Its totient is φ = 981021220236.

The previous prime is 981021220051. The next prime is 981021220241. The reversal of 981021220237 is 732022120189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 854480233161 + 126540987076 = 924381^2 + 355726^2 .

It is a cyclic number.

It is not a de Polignac number, because 981021220237 - 2¹⁵ = 981021187469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 981021220196 and 981021220205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981021220297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490510610118 + 490510610119.

It is an arithmetic number, because the mean of its divisors is an integer number (490510610119).

Almost surely, 2^981021220237 is an apocalyptic number.

It is an amenable number.

981021220237 is a deficient number, since it is larger than the sum of its proper divisors (1).

981021220237 is an equidigital number, since it uses as much as digits as its factorization.

981021220237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 981021220237 in words is "nine hundred eighty-one billion, twenty-one million, two hundred twenty thousand, two hundred thirty-seven".