10990121 has 2 divisors, whose sum is σ = 10990122. Its totient is φ = 10990120.

The previous prime is 10990117. The next prime is 10990123. The reversal of 10990121 is 12109901.

10990121 is digitally balanced in base 2 and base 3, because in such bases 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., 9834496 + 1155625 = 3136^2 + 1075^2 .

It is an emirp because it is prime and its reverse (12109901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10990121 - 2² = 10990117 is a prime.

It is a Sophie Germain prime.

Together with 10990123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10990123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495060 + 5495061.

It is an arithmetic number, because the mean of its divisors is an integer number (5495061).

Almost surely, 2^10990121 is an apocalyptic number.

It is an amenable number.

10990121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10990121 is an equidigital number, since it uses as much as digits as its factorization.

10990121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 10990121 is about 3315.1351405335. The cubic root of 10990121 is about 222.3314112393.

It can be divided in two parts, 10990 and 121, that added together give a palindrome (11111).

The spelling of 10990121 in words is "ten million, nine hundred ninety thousand, one hundred twenty-one".