2011321381 has 2 divisors, whose sum is σ = 2011321382. Its totient is φ = 2011321380.

The previous prime is 2011321343. The next prime is 2011321421. The reversal of 2011321381 is 1831231102.

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., 1331885025 + 679436356 = 36495^2 + 26066^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011321381 - 2⁹ = 2011320869 is a prime.

It is a super-2 number, since 2×2011321381² = 8090827395335494322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011321681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005660690 + 1005660691.

It is an arithmetic number, because the mean of its divisors is an integer number (1005660691).

Almost surely, 2^2011321381 is an apocalyptic number.

It is an amenable number.

2011321381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011321381 is an equidigital number, since it uses as much as digits as its factorization.

2011321381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2011321381 is about 44847.7578146333. The cubic root of 2011321381 is about 1262.2939191909.

Adding to 2011321381 its reverse (1831231102), we get a palindrome (3842552483).

The spelling of 2011321381 in words is "two billion, eleven million, three hundred twenty-one thousand, three hundred eighty-one".