21125183 has 2 divisors, whose sum is σ = 21125184. Its totient is φ = 21125182.

The previous prime is 21125177. The next prime is 21125219. The reversal of 21125183 is 38152112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21125183 - 2⁸ = 21124927 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21125123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562591 + 10562592.

It is an arithmetic number, because the mean of its divisors is an integer number (10562592).

Almost surely, 2^21125183 is an apocalyptic number.

21125183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21125183 is an equidigital number, since it uses as much as digits as its factorization.

21125183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 21125183 is about 4596.2139854450. The cubic root of 21125183 is about 276.4395389189.

Adding to 21125183 its reverse (38152112), we get a palindrome (59277295).

The spelling of 21125183 in words is "twenty-one million, one hundred twenty-five thousand, one hundred eighty-three".