22001212081 has 2 divisors, whose sum is σ = 22001212082. Its totient is φ = 22001212080.

The previous prime is 22001212067. The next prime is 22001212109. The reversal of 22001212081 is 18021210022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21346671025 + 654541056 = 146105^2 + 25584^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001212081 - 2¹⁵ = 22001179313 is a prime.

It is a super-2 number, since 2×22001212081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22001212381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000606040 + 11000606041.

It is an arithmetic number, because the mean of its divisors is an integer number (11000606041).

Almost surely, 2^22001212081 is an apocalyptic number.

It is an amenable number.

22001212081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001212081 is an equidigital number, since it uses as much as digits as its factorization.

22001212081 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 19.

The spelling of 22001212081 in words is "twenty-two billion, one million, two hundred twelve thousand, eighty-one".