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21132213 = 329534583
BaseRepresentation
bin101000010011…
…1001110110101
31110202121221120
41100213032311
520402212323
62032534153
7344422644
oct120471665
943677846
1021132213
1110a23a43
1270b1359
1344bb88b
142b4135b
151cc65e3
hex14273b5

21132213 has 16 divisors (see below), whose sum is σ = 29704320. Its totient is φ = 13342784.

The previous prime is 21132211. The next prime is 21132229. The reversal of 21132213 is 31223112.

It is not a de Polignac number, because 21132213 - 21 = 21132211 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21132192 and 21132201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2320 + ... + 6902.

It is an arithmetic number, because the mean of its divisors is an integer number (1856520).

Almost surely, 221132213 is an apocalyptic number.

It is an amenable number.

21132213 is a deficient number, since it is larger than the sum of its proper divisors (8572107).

21132213 is a wasteful number, since it uses less digits than its factorization.

21132213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668.

The product of its digits is 72, while the sum is 15.

The square root of 21132213 is about 4596.9786816995. The cubic root of 21132213 is about 276.4701998672.

Adding to 21132213 its reverse (31223112), we get a palindrome (52355325).

The spelling of 21132213 in words is "twenty-one million, one hundred thirty-two thousand, two hundred thirteen".

Divisors: 1 3 29 53 87 159 1537 4583 4611 13749 132907 242899 398721 728697 7044071 21132213