21725063 has 2 divisors, whose sum is σ = 21725064. Its totient is φ = 21725062.

The previous prime is 21725059. The next prime is 21725101. The reversal of 21725063 is 36052712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21725063 - 2² = 21725059 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21725003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10862531 + 10862532.

It is an arithmetic number, because the mean of its divisors is an integer number (10862532).

Almost surely, 2^21725063 is an apocalyptic number.

21725063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21725063 is an equidigital number, since it uses as much as digits as its factorization.

21725063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21725063 is about 4661.0152327578. The cubic root of 21725063 is about 279.0317876792.

Adding to 21725063 its reverse (36052712), we get a palindrome (57777775).

The spelling of 21725063 in words is "twenty-one million, seven hundred twenty-five thousand, sixty-three".