21126463 has 2 divisors, whose sum is σ = 21126464. Its totient is φ = 21126462.

The previous prime is 21126451. The next prime is 21126467. The reversal of 21126463 is 36462112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21126463 - 2⁵ = 21126431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21126467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563231 + 10563232.

It is an arithmetic number, because the mean of its divisors is an integer number (10563232).

Almost surely, 2^21126463 is an apocalyptic number.

21126463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126463 is an equidigital number, since it uses as much as digits as its factorization.

21126463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 21126463 is about 4596.3532283757. The cubic root of 21126463 is about 276.4451220732.

Adding to 21126463 its reverse (36462112), we get a palindrome (57588575).

The spelling of 21126463 in words is "twenty-one million, one hundred twenty-six thousand, four hundred sixty-three".