21190063 has 2 divisors, whose sum is σ = 21190064. Its totient is φ = 21190062.

The previous prime is 21190051. The next prime is 21190067. The reversal of 21190063 is 36009112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21190063 - 2⁹ = 21189551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21190067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10595031 + 10595032.

It is an arithmetic number, because the mean of its divisors is an integer number (10595032).

Almost surely, 2^21190063 is an apocalyptic number.

21190063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21190063 is an equidigital number, since it uses as much as digits as its factorization.

21190063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 21190063 is about 4603.2665575654. The cubic root of 21190063 is about 276.7222515372.

Adding to 21190063 its reverse (36009112), we get a palindrome (57199175).

The spelling of 21190063 in words is "twenty-one million, one hundred ninety thousand, sixty-three".