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1210120221 = 3537610819
BaseRepresentation
bin100100000100000…
…1111100000011101
310010100001110212110
41020020033200131
54434242321341
6320025024233
741662565202
oct11010174035
93110043773
101210120221
11571099262
12299325079
1316392898b
14b6a05ca9
1571389216
hex4820f81d

1210120221 has 8 divisors (see below), whose sum is σ = 1643937120. Its totient is φ = 791525072.

The previous prime is 1210120193. The next prime is 1210120283. The reversal of 1210120221 is 1220210121.

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

It is a cyclic number.

It is not a de Polignac number, because 1210120221 - 25 = 1210120189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210120197 and 1210120206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210120721) 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, 3805251 + ... + 3805568.

It is an arithmetic number, because the mean of its divisors is an integer number (205492140).

Almost surely, 21210120221 is an apocalyptic number.

It is an amenable number.

1210120221 is a deficient number, since it is larger than the sum of its proper divisors (433816899).

1210120221 is an equidigital number, since it uses as much as digits as its factorization.

1210120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610875.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1210120221 is about 34786.7822743064. The cubic root of 1210120221 is about 1065.6375269936.

Adding to 1210120221 its reverse (1220210121), we get a palindrome (2430330342).

The spelling of 1210120221 in words is "one billion, two hundred ten million, one hundred twenty thousand, two hundred twenty-one".

Divisors: 1 3 53 159 7610819 22832457 403373407 1210120221