21004414463 has 2 divisors, whose sum is σ = 21004414464. Its totient is φ = 21004414462.

The previous prime is 21004414439. The next prime is 21004414493. The reversal of 21004414463 is 36441440012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004414463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004414493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502207231 + 10502207232.

It is an arithmetic number, because the mean of its divisors is an integer number (10502207232).

Almost surely, 2^21004414463 is an apocalyptic number.

21004414463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004414463 is an equidigital number, since it uses as much as digits as its factorization.

21004414463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21004414463 its reverse (36441440012), we get a palindrome (57445854475).

The spelling of 21004414463 in words is "twenty-one billion, four million, four hundred fourteen thousand, four hundred sixty-three".