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11001221 = 711142873
BaseRepresentation
bin101001111101…
…110110000101
3202200220211122
4221331312011
510304014341
61031443325
7162336350
oct51756605
922626748
1011001221
116234420
123826545
1323824ca
141665297
15e7494b
hexa7dd85

11001221 has 8 divisors (see below), whose sum is σ = 13715904. Its totient is φ = 8572320.

The previous prime is 11001217. The next prime is 11001239. The reversal of 11001221 is 12210011.

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 11001221 - 22 = 11001217 is a prime.

It is a Duffinian number.

11001221 is a modest number, since divided by 1221 gives 11 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11001199 and 11001208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001241) 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, 71360 + ... + 71513.

It is an arithmetic number, because the mean of its divisors is an integer number (1714488).

Almost surely, 211001221 is an apocalyptic number.

11001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001221 is a deficient number, since it is larger than the sum of its proper divisors (2714683).

11001221 is a wasteful number, since it uses less digits than its factorization.

11001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142891.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 11001221 is about 3316.8088579235. The cubic root of 11001221 is about 222.4062374788.

Adding to 11001221 its reverse (12210011), we get a palindrome (23211232).

The spelling of 11001221 in words is "eleven million, one thousand, two hundred twenty-one".

Divisors: 1 7 11 77 142873 1000111 1571603 11001221