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120243221 = 7137312511
BaseRepresentation
bin1110010101011…
…00010000010101
322101020222200122
413022230100111
5221240240341
615533121325
72660023220
oct712542025
9271228618
10120243221
116196856a
1234329245
131bbb0847
1411d805b7
15a85294b
hex72ac415

120243221 has 8 divisors (see below), whose sum is σ = 137531904. Its totient is φ = 102982320.

The previous prime is 120243217. The next prime is 120243223. The reversal of 120243221 is 122342021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 120243221 - 22 = 120243217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120243221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120243223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3356 + ... + 15866.

It is an arithmetic number, because the mean of its divisors is an integer number (17191488).

Almost surely, 2120243221 is an apocalyptic number.

It is an amenable number.

120243221 is a deficient number, since it is larger than the sum of its proper divisors (17288683).

120243221 is a wasteful number, since it uses less digits than its factorization.

120243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13891.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 120243221 is about 10965.5469995801. The cubic root of 120243221 is about 493.5754314028.

Adding to 120243221 its reverse (122342021), we get a palindrome (242585242).

The spelling of 120243221 in words is "one hundred twenty million, two hundred forty-three thousand, two hundred twenty-one".

Divisors: 1 7 1373 9611 12511 87577 17177603 120243221