12220081 has 2 divisors, whose sum is σ = 12220082. Its totient is φ = 12220080.

The previous prime is 12220037. The next prime is 12220111. The reversal of 12220081 is 18002221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10758400 + 1461681 = 3280^2 + 1209^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220081 - 2¹¹ = 12218033 is a prime.

It is a super-2 number, since 2×12220081² = 298660759293122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12220031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110040 + 6110041.

It is an arithmetic number, because the mean of its divisors is an integer number (6110041).

Almost surely, 2^12220081 is an apocalyptic number.

It is an amenable number.

12220081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220081 is an equidigital number, since it uses as much as digits as its factorization.

12220081 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 16.

The square root of 12220081 is about 3495.7232441943. The cubic root of 12220081 is about 230.3339886222. Note that the first 3 decimals are identical.

The spelling of 12220081 in words is "twelve million, two hundred twenty thousand, eighty-one".