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BaseRepresentation
bin100101010000111111011
32022001001111
410222013323
5303033430
642101151
713244050
oct4520773
92261044
101221115
11764495
124aa7b7
13339a6c
1423b027
15191c2a
hex12a1fb

1221115 has 16 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 828000.

The previous prime is 1221113. The next prime is 1221119. The reversal of 1221115 is 5111221.

It is not a de Polignac number, because 1221115 - 21 = 1221113 is a prime.

It is a super-2 number, since 2×12211152 = 2982243686450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221095 and 1221104.

It is not an unprimeable number, because it can be changed into a prime (1221113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4740 + ... + 4990.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

21221115 is an apocalyptic number.

1221115 is a deficient number, since it is larger than the sum of its proper divisors (472325).

1221115 is a wasteful number, since it uses less digits than its factorization.

1221115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402.

The product of its digits is 20, while the sum is 13.

The square root of 1221115 is about 1105.0407232315. The cubic root of 1221115 is about 106.8855153066.

Adding to 1221115 its reverse (5111221), we get a palindrome (6332336).

The spelling of 1221115 in words is "one million, two hundred twenty-one thousand, one hundred fifteen".