11381021291 has 2 divisors, whose sum is σ = 11381021292. Its totient is φ = 11381021290.

The previous prime is 11381021287. The next prime is 11381021293. The reversal of 11381021291 is 19212018311.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11381021291 - 2² = 11381021287 is a prime.

Together with 11381021293, 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 (11381021293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5690510645 + 5690510646.

It is an arithmetic number, because the mean of its divisors is an integer number (5690510646).

Almost surely, 2^11381021291 is an apocalyptic number.

11381021291 is a deficient number, since it is larger than the sum of its proper divisors (1).

11381021291 is an equidigital number, since it uses as much as digits as its factorization.

11381021291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 29.

The spelling of 11381021291 in words is "eleven billion, three hundred eighty-one million, twenty-one thousand, two hundred ninety-one".