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10011001221 = 331328521371
BaseRepresentation
bin10010101001011001…
…11100000110000101
3221211200110112222000
421110230330012011
5131000304014341
64333214255513
7503040051324
oct112454740605
927750415860
1010011001221
114277a49431
121b347b7599
13c3706c980
146ad7c80bb
153d8d328b6
hex254b3c185

10011001221 has 16 divisors (see below), whose sum is σ = 15971968320. Its totient is φ = 6160615920.

The previous prime is 10011001193. The next prime is 10011001241. The reversal of 10011001221 is 12210011001.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2k-10011001221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011001241) 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, 14260335 + ... + 14261036.

It is an arithmetic number, because the mean of its divisors is an integer number (998248020).

Almost surely, 210011001221 is an apocalyptic number.

It is an amenable number.

10011001221 is a deficient number, since it is larger than the sum of its proper divisors (5960967099).

10011001221 is a wasteful number, since it uses less digits than its factorization.

10011001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28521393 (or 28521387 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10011001221 its reverse (12210011001), we get a palindrome (22221012222).

The spelling of 10011001221 in words is "ten billion, eleven million, one thousand, two hundred twenty-one".

Divisors: 1 3 9 13 27 39 117 351 28521371 85564113 256692339 370777823 770077017 1112333469 3337000407 10011001221