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BaseRepresentation
bin100101010011001001101
32022002120110
410222121031
5303102341
642110233
713250220
oct4523115
92262513
101222221
11765300
124ab379
1333a410
1423b5b7
15192216
hex12a64d

1222221 has 48 divisors (see below), whose sum is σ = 2264192. Its totient is φ = 570240.

The previous prime is 1222219. The next prime is 1222229.

1222221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1222221 - 21 = 1222219 is a prime.

It is an Ulam number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1222197 and 1222206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33015 + ... + 33051.

21222221 is an apocalyptic number.

1222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222221 is a deficient number, since it is larger than the sum of its proper divisors (1041971).

1222221 is a wasteful number, since it uses less digits than its factorization.

1222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 71 counting only the distinct ones).

The product of its digits is 32, while the sum is 12.

The square root of 1222221 is about 1105.5410440142. The cubic root of 1222221 is about 106.9177753606.

It can be divided in two parts, 1 and 222221, that added together give a palindrome (222222).

The spelling of 1222221 in words is "one million, two hundred twenty-two thousand, two hundred twenty-one".