21740063 has 2 divisors, whose sum is σ = 21740064. Its totient is φ = 21740062.

The previous prime is 21740051. The next prime is 21740101. The reversal of 21740063 is 36004712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21740063 - 2⁶ = 21739999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21740003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10870031 + 10870032.

It is an arithmetic number, because the mean of its divisors is an integer number (10870032).

Almost surely, 2^21740063 is an apocalyptic number.

21740063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21740063 is an equidigital number, since it uses as much as digits as its factorization.

21740063 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 21740063 is about 4662.6240466072. The cubic root of 21740063 is about 279.0959917723.

Adding to 21740063 its reverse (36004712), we get a palindrome (57744775).

The spelling of 21740063 in words is "twenty-one million, seven hundred forty thousand, sixty-three".