11779340921 has 2 divisors, whose sum is σ = 11779340922. Its totient is φ = 11779340920.

The previous prime is 11779340917. The next prime is 11779340933. The reversal of 11779340921 is 12904397711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6775759225 + 5003581696 = 82315^2 + 70736^2 .

It is a cyclic number.

It is not a de Polignac number, because 11779340921 - 2² = 11779340917 is a prime.

It is not a weakly prime, because it can be changed into another prime (11779340021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5889670460 + 5889670461.

It is an arithmetic number, because the mean of its divisors is an integer number (5889670461).

Almost surely, 2^11779340921 is an apocalyptic number.

It is an amenable number.

11779340921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11779340921 is an equidigital number, since it uses as much as digits as its factorization.

11779340921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The spelling of 11779340921 in words is "eleven billion, seven hundred seventy-nine million, three hundred forty thousand, nine hundred twenty-one".