120021121 has 4 divisors (see below), whose sum is σ = 130932144. Its totient is φ = 109110100.

The previous prime is 120021101. The next prime is 120021137. The reversal of 120021121 is 121120021.

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 not a de Polignac number, because 120021121 - 2⁷ = 120020993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120021098 and 120021107.

It is not an unprimeable number, because it can be changed into a prime (120021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5455495 + ... + 5455516.

It is an arithmetic number, because the mean of its divisors is an integer number (32733036).

Almost surely, 2^120021121 is an apocalyptic number.

120021121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120021121 is a deficient number, since it is larger than the sum of its proper divisors (10911023).

120021121 is a wasteful number, since it uses less digits than its factorization.

120021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10911022.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 120021121 is about 10955.4151450322. The cubic root of 120021121 is about 493.2713514269.

Adding to 120021121 its reverse (121120021), we get a palindrome (241141142).

It can be divided in two parts, 120021 and 121, that multiplied together give a palindrome (14522541).

The spelling of 120021121 in words is "one hundred twenty million, twenty-one thousand, one hundred twenty-one".