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13122031221 = 3213359312407
BaseRepresentation
bin11000011100010001…
…00100111001110101
31020212111102020211100
430032020210321311
5203333214444341
610010030400313
7643114265535
oct141610447165
936774366740
1013122031221
115624054302
122662660099
13131175a320
148c6a534c5
1551c0093b6
hex30e224e75

13122031221 has 24 divisors (see below), whose sum is σ = 20468972160. Its totient is φ = 8052577056.

The previous prime is 13122031193. The next prime is 13122031253. The reversal of 13122031221 is 12213022131.

13122031221 is a `hidden beast` number, since 1 + 312 + 20 + 312 + 21 = 666.

It is not a de Polignac number, because 13122031221 - 225 = 13088476789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13122031194 and 13122031203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13122041221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114201 + ... + 198206.

It is an arithmetic number, because the mean of its divisors is an integer number (852873840).

Almost surely, 213122031221 is an apocalyptic number.

It is an amenable number.

13122031221 is a deficient number, since it is larger than the sum of its proper divisors (7346940939).

13122031221 is a wasteful number, since it uses less digits than its factorization.

13122031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312785 (or 312782 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 13122031221 its reverse (12213022131), we get a palindrome (25335053352).

The spelling of 13122031221 in words is "thirteen billion, one hundred twenty-two million, thirty-one thousand, two hundred twenty-one".

Divisors: 1 3 9 13 39 117 359 1077 3231 4667 14001 42003 312407 937221 2811663 4061291 12183873 36551619 112154113 336462339 1009387017 1458003469 4374010407 13122031221