Search a number
-
+
21136123 is a prime number
BaseRepresentation
bin101000010100…
…0001011111011
31110202211022101
41100220023323
520402323443
62033004231
7344440231
oct120501373
943684271
1021136123
1110a26978
1270b3677
1344c05a8
142b42951
151cc784d
hex14282fb

21136123 has 2 divisors, whose sum is σ = 21136124. Its totient is φ = 21136122.

The previous prime is 21136069. The next prime is 21136127. The reversal of 21136123 is 32163112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21136123 is a prime.

It is a super-2 number, since 2×211361232 = 893471390942258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21136123.

It is not a weakly prime, because it can be changed into another prime (21136127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568061 + 10568062.

It is an arithmetic number, because the mean of its divisors is an integer number (10568062).

Almost surely, 221136123 is an apocalyptic number.

21136123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21136123 is an equidigital number, since it uses as much as digits as its factorization.

21136123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 21136123 is about 4597.4039413565. The cubic root of 21136123 is about 276.4872501688.

Adding to 21136123 its reverse (32163112), we get a palindrome (53299235).

The spelling of 21136123 in words is "twenty-one million, one hundred thirty-six thousand, one hundred twenty-three".