120121001 has 64 divisors (see below), whose sum is σ = 172032000. Its totient is φ = 82555200.

The previous prime is 120120967. The next prime is 120121009. The reversal of 120121001 is 100121021.

It is not a de Polignac number, because 120121001 - 2⁶ = 120120937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120121001.

It is not an unprimeable number, because it can be changed into a prime (120121009) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1520480 + ... + 1520558.

It is an arithmetic number, because the mean of its divisors is an integer number (2688000).

Almost surely, 2^120121001 is an apocalyptic number.

120121001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120121001 is a deficient number, since it is larger than the sum of its proper divisors (51910999).

120121001 is a wasteful number, since it uses less digits than its factorization.

120121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 141 counting only the distinct ones).

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

The square root of 120121001 is about 10959.9726733236. The cubic root of 120121001 is about 493.4081448007.

Adding to 120121001 its reverse (100121021), we get a palindrome (220242022).

It can be divided in two parts, 120 and 121001, that added together give a palindrome (121121).

The spelling of 120121001 in words is "one hundred twenty million, one hundred twenty-one thousand, one".