221021000119981 has 2 divisors, whose sum is σ = 221021000119982. Its totient is φ = 221021000119980.

The previous prime is 221021000119901. The next prime is 221021000120087. The reversal of 221021000119981 is 189911000120122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196717174848100 + 24303825271881 = 14025590^2 + 4929891^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021000119981 - 2⁷ = 221021000119853 is a prime.

It is a super-2 number, since 2×221021000119981² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221021000119981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021000119901) 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, 110510500059990 + 110510500059991.

It is an arithmetic number, because the mean of its divisors is an integer number (110510500059991).

Almost surely, 2^{221021000119981} is an apocalyptic number.

It is an amenable number.

221021000119981 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021000119981 is an equidigital number, since it uses as much as digits as its factorization.

221021000119981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 221021000119981 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred nineteen thousand, nine hundred eighty-one".