2011972118381 has 2 divisors, whose sum is σ = 2011972118382. Its totient is φ = 2011972118380.

The previous prime is 2011972118339. The next prime is 2011972118383. The reversal of 2011972118381 is 1838112791102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1521685076356 + 490287042025 = 1233566^2 + 700205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011972118381 is a prime.

It is a super-2 number, since 2×2011972118381² (a number of 25 digits) contains 22 as substring.

Together with 2011972118383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011972118383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005986059190 + 1005986059191.

It is an arithmetic number, because the mean of its divisors is an integer number (1005986059191).

Almost surely, 2^{2011972118381} is an apocalyptic number.

It is an amenable number.

2011972118381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011972118381 is an equidigital number, since it uses as much as digits as its factorization.

2011972118381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 44.

The spelling of 2011972118381 in words is "two trillion, eleven billion, nine hundred seventy-two million, one hundred eighteen thousand, three hundred eighty-one".