22021000181 has 2 divisors, whose sum is σ = 22021000182. Its totient is φ = 22021000180.

The previous prime is 22021000163. The next prime is 22021000187. The reversal of 22021000181 is 18100012022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21788712100 + 232288081 = 147610^2 + 15241^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021000181 - 2¹⁴ = 22020983797 is a prime.

It is a super-2 number, since 2×22021000181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22021000187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010500090 + 11010500091.

It is an arithmetic number, because the mean of its divisors is an integer number (11010500091).

Almost surely, 2^22021000181 is an apocalyptic number.

It is an amenable number.

22021000181 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021000181 is an equidigital number, since it uses as much as digits as its factorization.

22021000181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

The spelling of 22021000181 in words is "twenty-two billion, twenty-one million, one hundred eighty-one", and thus it is an aban number.