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13202021 = 72269429
BaseRepresentation
bin110010010111…
…001001100101
3220211201202202
4302113021211
511334431041
61150544245
7220133600
oct62271145
926751682
1013202021
1174a7968
124508085
132973161
141a79337
15125ba9b
hexc97265

13202021 has 6 divisors (see below), whose sum is σ = 15357510. Its totient is φ = 11315976.

The previous prime is 13202011. The next prime is 13202029. The reversal of 13202021 is 12020231.

It is a happy number.

13202021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8850625 + 4351396 = 2975^2 + 2086^2 .

It is not a de Polignac number, because 13202021 - 26 = 13201957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13201993 and 13202011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13202029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 134666 + ... + 134763.

It is an arithmetic number, because the mean of its divisors is an integer number (2559585).

Almost surely, 213202021 is an apocalyptic number.

It is an amenable number.

13202021 is a deficient number, since it is larger than the sum of its proper divisors (2155489).

13202021 is an equidigital number, since it uses as much as digits as its factorization.

13202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269443 (or 269436 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 13202021 is about 3633.4585452431. The cubic root of 13202021 is about 236.3452108239.

Adding to 13202021 its reverse (12020231), we get a palindrome (25222252).

The spelling of 13202021 in words is "thirteen million, two hundred two thousand, twenty-one".

Divisors: 1 7 49 269429 1886003 13202021