22221210222181 has 2 divisors, whose sum is σ = 22221210222182. Its totient is φ = 22221210222180.

The previous prime is 22221210222157. The next prime is 22221210222307. The reversal of 22221210222181 is 18122201212222.

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., 11587147920100 + 10634062302081 = 3403990^2 + 3260991^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221210222181 - 2¹⁷ = 22221210091109 is a prime.

It is a super-2 number, since 2×22221210222181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22221210222151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110605111090 + 11110605111091.

It is an arithmetic number, because the mean of its divisors is an integer number (11110605111091).

Almost surely, 2^{22221210222181} is an apocalyptic number.

It is an amenable number.

22221210222181 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221210222181 is an equidigital number, since it uses as much as digits as its factorization.

22221210222181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 28.

The spelling of 22221210222181 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty-two thousand, one hundred eighty-one".