11155846921 has 2 divisors, whose sum is σ = 11155846922. Its totient is φ = 11155846920.

The previous prime is 11155846847. The next prime is 11155846939. The reversal of 11155846921 is 12964855111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8768449600 + 2387397321 = 93640^2 + 48861^2 .

It is a cyclic number.

It is not a de Polignac number, because 11155846921 - 2²³ = 11147458313 is a prime.

It is not a weakly prime, because it can be changed into another prime (11155846951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5577923460 + 5577923461.

It is an arithmetic number, because the mean of its divisors is an integer number (5577923461).

Almost surely, 2^11155846921 is an apocalyptic number.

It is an amenable number.

11155846921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11155846921 is an equidigital number, since it uses as much as digits as its factorization.

11155846921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 43.

The spelling of 11155846921 in words is "eleven billion, one hundred fifty-five million, eight hundred forty-six thousand, nine hundred twenty-one".