4000220219981 has 2 divisors, whose sum is σ = 4000220219982. Its totient is φ = 4000220219980.

The previous prime is 4000220219929. The next prime is 4000220220041. The reversal of 4000220219981 is 1899120220004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3214009930756 + 786210289225 = 1792766^2 + 886685^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000220219981 - 2¹⁰ = 4000220218957 is a prime.

It is a super-2 number, since 2×4000220219981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000220209981) 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, 2000110109990 + 2000110109991.

It is an arithmetic number, because the mean of its divisors is an integer number (2000110109991).

Almost surely, 2^{4000220219981} is an apocalyptic number.

It is an amenable number.

4000220219981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000220219981 is an equidigital number, since it uses as much as digits as its factorization.

4000220219981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

Adding to 4000220219981 its reverse (1899120220004), we get a palindrome (5899340439985).

The spelling of 4000220219981 in words is "four trillion, two hundred twenty million, two hundred nineteen thousand, nine hundred eighty-one".