21046463 has 2 divisors, whose sum is σ = 21046464. Its totient is φ = 21046462.

The previous prime is 21046447. The next prime is 21046477. The reversal of 21046463 is 36464012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21046463 - 2⁴ = 21046447 is a prime.

It is equal to p_1332737 and since 21046463 and 1332737 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21040463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10523231 + 10523232.

It is an arithmetic number, because the mean of its divisors is an integer number (10523232).

Almost surely, 2^21046463 is an apocalyptic number.

21046463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21046463 is an equidigital number, since it uses as much as digits as its factorization.

21046463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 21046463 is about 4587.6424228573. The cubic root of 21046463 is about 276.0957406071.

The spelling of 21046463 in words is "twenty-one million, forty-six thousand, four hundred sixty-three".