120121011 has 6 divisors (see below), whose sum is σ = 173508140. Its totient is φ = 80080668.

The previous prime is 120121009. The next prime is 120121013. The reversal of 120121011 is 110121021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (120121009) and next prime (120121013).

It is not a de Polignac number, because 120121011 - 2¹ = 120121009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 13346779 = 120121011 / (1 + 2 + 0 + 1 + 2 + 1 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120120984 and 120121002.

It is not an unprimeable number, because it can be changed into a prime (120121013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6673381 + ... + 6673398.

Almost surely, 2^120121011 is an apocalyptic number.

120121011 is a deficient number, since it is larger than the sum of its proper divisors (53387129).

120121011 is a wasteful number, since it uses less digits than its factorization.

120121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13346785 (or 13346782 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 120121011 is about 10959.9731295291. The cubic root of 120121011 is about 493.4081584926.

Adding to 120121011 its reverse (110121021), we get a palindrome (230242032).

The spelling of 120121011 in words is "one hundred twenty million, one hundred twenty-one thousand, eleven".