21126893 has 2 divisors, whose sum is σ = 21126894. Its totient is φ = 21126892.

The previous prime is 21126887. The next prime is 21126899. The reversal of 21126893 is 39862112.

It is a balanced prime because it is at equal distance from previous prime (21126887) and next prime (21126899).

It can be written as a sum of positive squares in only one way, i.e., 13520329 + 7606564 = 3677^2 + 2758^2 .

It is a cyclic number.

It is not a de Polignac number, because 21126893 - 2¹⁰ = 21125869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21126899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563446 + 10563447.

It is an arithmetic number, because the mean of its divisors is an integer number (10563447).

Almost surely, 2^21126893 is an apocalyptic number.

It is an amenable number.

21126893 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126893 is an equidigital number, since it uses as much as digits as its factorization.

21126893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 21126893 is about 4596.4000043512. The cubic root of 21126893 is about 276.4469976134.

The spelling of 21126893 in words is "twenty-one million, one hundred twenty-six thousand, eight hundred ninety-three".