7100921 has 2 divisors, whose sum is σ = 7100922. Its totient is φ = 7100920.

The previous prime is 7100909. The next prime is 7100941. The reversal of 7100921 is 1290017.

7100921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (7100941) can be obtained adding 7100921 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4682896 + 2418025 = 2164^2 + 1555^2 .

It is a cyclic number.

It is not a de Polignac number, because 7100921 - 2⁶ = 7100857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7100893 and 7100902.

It is not a weakly prime, because it can be changed into another prime (7100941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3550460 + 3550461.

It is an arithmetic number, because the mean of its divisors is an integer number (3550461).

Almost surely, 2^7100921 is an apocalyptic number.

It is an amenable number.

7100921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7100921 is an equidigital number, since it uses as much as digits as its factorization.

7100921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 7100921 is about 2664.7553358611. The cubic root of 7100921 is about 192.2080445264.

Adding to 7100921 its reverse (1290017), we get a palindrome (8390938).

The spelling of 7100921 in words is "seven million, one hundred thousand, nine hundred twenty-one".