21727463 has 2 divisors, whose sum is σ = 21727464. Its totient is φ = 21727462.

The previous prime is 21727451. The next prime is 21727477. The reversal of 21727463 is 36472712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21727463 - 2¹² = 21723367 is a 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 (21727493) 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, 10863731 + 10863732.

It is an arithmetic number, because the mean of its divisors is an integer number (10863732).

Almost surely, 2^21727463 is an apocalyptic number.

21727463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21727463 is an equidigital number, since it uses as much as digits as its factorization.

21727463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 32.

The square root of 21727463 is about 4661.2726802881. The cubic root of 21727463 is about 279.0420623197.

The spelling of 21727463 in words is "twenty-one million, seven hundred twenty-seven thousand, four hundred sixty-three".