2211201281 has 2 divisors, whose sum is σ = 2211201282. Its totient is φ = 2211201280.

The previous prime is 2211201277. The next prime is 2211201283. The reversal of 2211201281 is 1821021122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1147854400 + 1063346881 = 33880^2 + 32609^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211201281 - 2² = 2211201277 is a prime.

It is a super-2 number, since 2×2211201281² = 9778822210192081922, which contains 22 as substring.

Together with 2211201283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2211201283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105600640 + 1105600641.

It is an arithmetic number, because the mean of its divisors is an integer number (1105600641).

Almost surely, 2^2211201281 is an apocalyptic number.

It is an amenable number.

2211201281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211201281 is an equidigital number, since it uses as much as digits as its factorization.

2211201281 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 20.

The square root of 2211201281 is about 47023.4120518705. The cubic root of 2211201281 is about 1302.7950279405.

The spelling of 2211201281 in words is "two billion, two hundred eleven million, two hundred one thousand, two hundred eighty-one".