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1221000223 = 11087110129
BaseRepresentation
bin100100011000110…
…1111110000011111
310011002112020102111
41020301233300133
510000034001343
6321054134451
742154221262
oct11061576037
93132466374
101221000223
1157724a5a3
122a0ab1427
13165c67c51
14b8238cd9
15722d7c9d
hex48c6fc1f

1221000223 has 4 divisors (see below), whose sum is σ = 1221121440. Its totient is φ = 1220879008.

The previous prime is 1221000203. The next prime is 1221000227. The reversal of 1221000223 is 3220001221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221000223 - 221 = 1218903071 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 (1221000227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43978 + ... + 66151.

It is an arithmetic number, because the mean of its divisors is an integer number (305280360).

Almost surely, 21221000223 is an apocalyptic number.

1221000223 is a deficient number, since it is larger than the sum of its proper divisors (121217).

1221000223 is a wasteful number, since it uses less digits than its factorization.

1221000223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121216.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1221000223 is about 34942.8136102404. The cubic root of 1221000223 is about 1068.8216635005.

Adding to 1221000223 its reverse (3220001221), we get a palindrome (4441001444).

The spelling of 1221000223 in words is "one billion, two hundred twenty-one million, two hundred twenty-three", and thus it is an aban number.

Divisors: 1 11087 110129 1221000223