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BaseRepresentation
bin1110010100100…
…00111010010101
322101001022001111
413022100322111
5221223144341
615530455021
72656045540
oct712207225
9271038044
10120131221
11618a1401
1234294471
131bb71882
1411d51857
15a82e681
hex7290e95

120131221 has 16 divisors (see below), whose sum is σ = 139864320. Its totient is φ = 101059200.

The previous prime is 120131213. The next prime is 120131227. The reversal of 120131221 is 122131021.

It is a cyclic number.

It is not a de Polignac number, because 120131221 - 23 = 120131213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120131227) 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 15 ways as a sum of consecutive naturals, for example, 93435 + ... + 94711.

It is an arithmetic number, because the mean of its divisors is an integer number (8741520).

Almost surely, 2120131221 is an apocalyptic number.

It is an amenable number.

120131221 is a deficient number, since it is larger than the sum of its proper divisors (19733099).

120131221 is a wasteful number, since it uses less digits than its factorization.

120131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 120131221 is about 10960.4389054453. The cubic root of 120131221 is about 493.4221376029.

Adding to 120131221 its reverse (122131021), we get a palindrome (242262242).

The spelling of 120131221 in words is "one hundred twenty million, one hundred thirty-one thousand, two hundred twenty-one".