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21011141 is a prime number
BaseRepresentation
bin101000000100…
…1101011000101
31110112110212102
41100021223011
520334324031
62030201445
7343406654
oct120115305
943473772
1021011141
1110950a88
127053285
134478738
142b0d19b
151ca07cb
hex1409ac5

21011141 has 2 divisors, whose sum is σ = 21011142. Its totient is φ = 21011140.

The previous prime is 21011083. The next prime is 21011143. The reversal of 21011141 is 14111012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12285025 + 8726116 = 3505^2 + 2954^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011141 - 218 = 20748997 is a prime.

It is a super-2 number, since 2×210111412 = 882936092243762, which contains 22 as substring.

Together with 21011143, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505570 + 10505571.

It is an arithmetic number, because the mean of its divisors is an integer number (10505571).

Almost surely, 221011141 is an apocalyptic number.

It is an amenable number.

21011141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011141 is an equidigital number, since it uses as much as digits as its factorization.

21011141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 21011141 is about 4583.7911165323. The cubic root of 21011141 is about 275.9411981782.

Adding to 21011141 its reverse (14111012), we get a palindrome (35122153).

The spelling of 21011141 in words is "twenty-one million, eleven thousand, one hundred forty-one".