21370463 has 2 divisors, whose sum is σ = 21370464. Its totient is φ = 21370462.

The previous prime is 21370457. The next prime is 21370483. The reversal of 21370463 is 36407312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21370463 - 2¹⁴ = 21354079 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 (21370483) 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, 10685231 + 10685232.

It is an arithmetic number, because the mean of its divisors is an integer number (10685232).

Almost surely, 2^21370463 is an apocalyptic number.

21370463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21370463 is an equidigital number, since it uses as much as digits as its factorization.

21370463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21370463 is about 4622.8198104620. The cubic root of 21370463 is about 277.5053181893.

Adding to 21370463 its reverse (36407312), we get a palindrome (57777775).

The spelling of 21370463 in words is "twenty-one million, three hundred seventy thousand, four hundred sixty-three".