10021121 has 4 divisors (see below), whose sum is σ = 10932144. Its totient is φ = 9110100.

The previous prime is 10021111. The next prime is 10021127. The reversal of 10021121 is 12112001.

10021121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12112001 = 11 ⋅1101091.

It is a cyclic number.

It is not a de Polignac number, because 10021121 - 2¹⁰ = 10020097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10021099 and 10021108.

It is not an unprimeable number, because it can be changed into a prime (10021127) 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, 455495 + ... + 455516.

It is an arithmetic number, because the mean of its divisors is an integer number (2733036).

Almost surely, 2^10021121 is an apocalyptic number.

10021121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10021121 is a deficient number, since it is larger than the sum of its proper divisors (911023).

10021121 is an equidigital number, since it uses as much as digits as its factorization.

10021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911022.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 10021121 is about 3165.6154219993. The cubic root of 10021121 is about 215.5950417246.

Adding to 10021121 its reverse (12112001), we get a palindrome (22133122).

The spelling of 10021121 in words is "ten million, twenty-one thousand, one hundred twenty-one".