10978921 has 2 divisors, whose sum is σ = 10978922. Its totient is φ = 10978920.

The previous prime is 10978901. The next prime is 10978927. The reversal of 10978921 is 12987901.

10978921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6817321 + 4161600 = 2611^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 10978921 - 2¹¹ = 10976873 is a prime.

It is not a weakly prime, because it can be changed into another prime (10978927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5489460 + 5489461.

It is an arithmetic number, because the mean of its divisors is an integer number (5489461).

Almost surely, 2^10978921 is an apocalyptic number.

It is an amenable number.

10978921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10978921 is an equidigital number, since it uses as much as digits as its factorization.

10978921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 10978921 is about 3313.4454877061. The cubic root of 10978921 is about 222.2558598062.

The spelling of 10978921 in words is "ten million, nine hundred seventy-eight thousand, nine hundred twenty-one".