11318657621 has 2 divisors, whose sum is σ = 11318657622. Its totient is φ = 11318657620.

The previous prime is 11318657591. The next prime is 11318657653. The reversal of 11318657621 is 12675681311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10054072900 + 1264584721 = 100270^2 + 35561^2 .

It is a cyclic number.

It is not a de Polignac number, because 11318657621 - 2⁶ = 11318657557 is a prime.

It is a super-2 number, since 2×11318657621² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11318657221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5659328810 + 5659328811.

It is an arithmetic number, because the mean of its divisors is an integer number (5659328811).

Almost surely, 2^11318657621 is an apocalyptic number.

It is an amenable number.

11318657621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11318657621 is an equidigital number, since it uses as much as digits as its factorization.

11318657621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The spelling of 11318657621 in words is "eleven billion, three hundred eighteen million, six hundred fifty-seven thousand, six hundred twenty-one".