2211320381 has 2 divisors, whose sum is σ = 2211320382. Its totient is φ = 2211320380.

The previous prime is 2211320369. The next prime is 2211320443. The reversal of 2211320381 is 1830231122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2028151225 + 183169156 = 45035^2 + 13534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211320381 is a prime.

It is a super-2 number, since 2×2211320381² = 9779875654851970322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211320311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105660190 + 1105660191.

It is an arithmetic number, because the mean of its divisors is an integer number (1105660191).

Almost surely, 2^2211320381 is an apocalyptic number.

It is an amenable number.

2211320381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211320381 is an equidigital number, since it uses as much as digits as its factorization.

2211320381 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2211320381 is about 47024.6784252694. The cubic root of 2211320381 is about 1302.8184179568.

The spelling of 2211320381 in words is "two billion, two hundred eleven million, three hundred twenty thousand, three hundred eighty-one".