9910921 has 2 divisors, whose sum is σ = 9910922. Its totient is φ = 9910920.

The previous prime is 9910919. The next prime is 9910973. The reversal of 9910921 is 1290199.

9910921 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 weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9853321 + 57600 = 3139^2 + 240^2 .

It is an emirp because it is prime and its reverse (1290199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9910921 - 2¹ = 9910919 is a prime.

Together with 9910919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9913921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4955460 + 4955461.

It is an arithmetic number, because the mean of its divisors is an integer number (4955461).

Almost surely, 2^9910921 is an apocalyptic number.

It is an amenable number.

9910921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9910921 is an equidigital number, since it uses as much as digits as its factorization.

9910921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 9910921 is about 3148.1615269868. The cubic root of 9910921 is about 214.8018437445.

The spelling of 9910921 in words is "nine million, nine hundred ten thousand, nine hundred twenty-one".