21404052263 has 16 divisors (see below), whose sum is σ = 23998732800. Its totient is φ = 18918295200.

The previous prime is 21404052259. The next prime is 21404052281. The reversal of 21404052263 is 36225040412.

It is a cyclic number.

It is not a de Polignac number, because 21404052263 - 2² = 21404052259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404052203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550598 + ... + 588188.

It is an arithmetic number, because the mean of its divisors is an integer number (1499920800).

Almost surely, 2^21404052263 is an apocalyptic number.

21404052263 is a deficient number, since it is larger than the sum of its proper divisors (2594680537).

21404052263 is a wasteful number, since it uses less digits than its factorization.

21404052263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39038.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21404052263 its reverse (36225040412), we get a palindrome (57629092675).

The spelling of 21404052263 in words is "twenty-one billion, four hundred four million, fifty-two thousand, two hundred sixty-three".