10117921 has 4 divisors (see below), whose sum is σ = 11037744. Its totient is φ = 9198100.

The previous prime is 10117889. The next prime is 10117931. The reversal of 10117921 is 12971101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10117921 - 2⁵ = 10117889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10117892 and 10117901.

It is not an unprimeable number, because it can be changed into a prime (10117931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459895 + ... + 459916.

It is an arithmetic number, because the mean of its divisors is an integer number (2759436).

Almost surely, 2^10117921 is an apocalyptic number.

10117921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10117921 is a deficient number, since it is larger than the sum of its proper divisors (919823).

10117921 is an equidigital number, since it uses as much as digits as its factorization.

10117921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919822.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 10117921 is about 3180.8679633081. The cubic root of 10117921 is about 216.2870055953.

The spelling of 10117921 in words is "ten million, one hundred seventeen thousand, nine hundred twenty-one".