21040963 has 2 divisors, whose sum is σ = 21040964. Its totient is φ = 21040962.

The previous prime is 21040937. The next prime is 21040967. The reversal of 21040963 is 36904012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21040963 - 2⁵ = 21040931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21040967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520481 + 10520482.

It is an arithmetic number, because the mean of its divisors is an integer number (10520482).

Almost surely, 2^21040963 is an apocalyptic number.

21040963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040963 is an equidigital number, since it uses as much as digits as its factorization.

21040963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21040963 is about 4587.0429472592. The cubic root of 21040963 is about 276.0716881274.

Adding to 21040963 its reverse (36904012), we get a palindrome (57944975).

The spelling of 21040963 in words is "twenty-one million, forty thousand, nine hundred sixty-three".