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22001221 = 1119105269
BaseRepresentation
bin101001111101…
…1011001000101
31112101210000001
41103323121011
521113014341
62103321301
7355002334
oct123733105
945353001
1022001221
1111467930
127450231
134734298
142cc9d1b
151de8d31
hex14fb645

22001221 has 8 divisors (see below), whose sum is σ = 25264800. Its totient is φ = 18948240.

The previous prime is 22001209. The next prime is 22001237. The reversal of 22001221 is 12210022.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-22001221 is a prime.

22001221 is a modest number, since divided by 1221 gives 22 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 22001198 and 22001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001261) 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, 52426 + ... + 52843.

It is an arithmetic number, because the mean of its divisors is an integer number (3158100).

Almost surely, 222001221 is an apocalyptic number.

It is an amenable number.

22001221 is a deficient number, since it is larger than the sum of its proper divisors (3263579).

22001221 is a wasteful number, since it uses less digits than its factorization.

22001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105299.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22001221 is about 4690.5459170549. The cubic root of 22001221 is about 280.2091167424.

Adding to 22001221 its reverse (12210022), we get a palindrome (34211243).

It can be divided in two parts, 22001 and 221, that added together give a palindrome (22222).

The spelling of 22001221 in words is "twenty-two million, one thousand, two hundred twenty-one".

Divisors: 1 11 19 209 105269 1157959 2000111 22001221