21276023 has 2 divisors, whose sum is σ = 21276024. Its totient is φ = 21276022.

The previous prime is 21275983. The next prime is 21276071. The reversal of 21276023 is 32067212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21276023 - 2¹⁰ = 21274999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21276023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21276083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10638011 + 10638012.

It is an arithmetic number, because the mean of its divisors is an integer number (10638012).

Almost surely, 2^21276023 is an apocalyptic number.

21276023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21276023 is an equidigital number, since it uses as much as digits as its factorization.

21276023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21276023 is about 4612.5939556826. The cubic root of 21276023 is about 277.0959322265.

The spelling of 21276023 in words is "twenty-one million, two hundred seventy-six thousand, twenty-three".