11387021 has 2 divisors, whose sum is σ = 11387022. Its totient is φ = 11387020.

The previous prime is 11387003. The next prime is 11387087. The reversal of 11387021 is 12078311.

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., 9796900 + 1590121 = 3130^2 + 1261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11387021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11317021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5693510 + 5693511.

It is an arithmetic number, because the mean of its divisors is an integer number (5693511).

Almost surely, 2^11387021 is an apocalyptic number.

It is an amenable number.

11387021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11387021 is an equidigital number, since it uses as much as digits as its factorization.

11387021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 11387021 is about 3374.4660318338. The cubic root of 11387021 is about 224.9762674557.

The spelling of 11387021 in words is "eleven million, three hundred eighty-seven thousand, twenty-one".