22021000212209 has 2 divisors, whose sum is σ = 22021000212210. Its totient is φ = 22021000212208.

The previous prime is 22021000212199. The next prime is 22021000212221. The reversal of 22021000212209 is 90221200012022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21125238288400 + 895761923809 = 4596220^2 + 946447^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021000212209 - 2⁴⁰ = 20921488584433 is a prime.

It is a super-2 number, since 2×22021000212209² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22021000212259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010500106104 + 11010500106105.

It is an arithmetic number, because the mean of its divisors is an integer number (11010500106105).

Almost surely, 2^{22021000212209} is an apocalyptic number.

It is an amenable number.

22021000212209 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021000212209 is an equidigital number, since it uses as much as digits as its factorization.

22021000212209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 22021000212209 in words is "twenty-two trillion, twenty-one billion, two hundred twelve thousand, two hundred nine".