11912921 has 2 divisors, whose sum is σ = 11912922. Its totient is φ = 11912920.

The previous prime is 11912911. The next prime is 11912933. The reversal of 11912921 is 12921911.

11912921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6056521 + 5856400 = 2461^2 + 2420^2 .

It is an emirp because it is prime and its reverse (12921911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11912921 - 2¹⁴ = 11896537 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11912911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5956460 + 5956461.

It is an arithmetic number, because the mean of its divisors is an integer number (5956461).

Almost surely, 2^11912921 is an apocalyptic number.

It is an amenable number.

11912921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11912921 is an equidigital number, since it uses as much as digits as its factorization.

11912921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 26.

The square root of 11912921 is about 3451.5099594236. The cubic root of 11912921 is about 228.3877226121.

The spelling of 11912921 in words is "eleven million, nine hundred twelve thousand, nine hundred twenty-one".