120001221 has 24 divisors (see below), whose sum is σ = 178956960. Its totient is φ = 77448096.

The previous prime is 120001201. The next prime is 120001229. The reversal of 120001221 is 122100021.

It is not a de Polignac number, because 120001221 - 2⁹ = 120000709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

120001221 is a modest number, since divided by 1221 gives 120 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120001229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33891 + ... + 37263.

It is an arithmetic number, because the mean of its divisors is an integer number (7456540).

Almost surely, 2^120001221 is an apocalyptic number.

It is an amenable number.

120001221 is a deficient number, since it is larger than the sum of its proper divisors (58955739).

120001221 is a wasteful number, since it uses less digits than its factorization.

120001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505 (or 3502 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 120001221 is about 10954.5068807318. The cubic root of 120001221 is about 493.2440877743.

Adding to 120001221 its reverse (122100021), we get a palindrome (242101242).

It can be divided in two parts, 1200012 and 21, that multiplied together give a palindrome (25200252).

The spelling of 120001221 in words is "one hundred twenty million, one thousand, two hundred twenty-one".