20221111002181 has 2 divisors, whose sum is σ = 20221111002182. Its totient is φ = 20221111002180.

The previous prime is 20221111002179. The next prime is 20221111002187. The reversal of 20221111002181 is 18120011112202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17490453901281 + 2730657100900 = 4182159^2 + 1652470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221111002181 - 2¹ = 20221111002179 is a prime.

It is a super-2 number, since 2×20221111002181² (a number of 27 digits) contains 22 as substring.

Together with 20221111002179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221111002187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110555501090 + 10110555501091.

It is an arithmetic number, because the mean of its divisors is an integer number (10110555501091).

Almost surely, 2^{20221111002181} is an apocalyptic number.

It is an amenable number.

20221111002181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221111002181 is an equidigital number, since it uses as much as digits as its factorization.

20221111002181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 20221111002181 its reverse (18120011112202), we get a palindrome (38341122114383).

The spelling of 20221111002181 in words is "twenty trillion, two hundred twenty-one billion, one hundred eleven million, two thousand, one hundred eighty-one".