21405232073463 has 72 divisors (see below), whose sum is σ = 35610181656192. Its totient is φ = 11400287705856.

The previous prime is 21405232073413. The next prime is 21405232073471. The reversal of 21405232073463 is 36437023250412.

It is not a de Polignac number, because 21405232073463 - 2⁶ = 21405232073399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405232073413) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1929856 + ... + 6821642.

It is an arithmetic number, because the mean of its divisors is an integer number (494585856336).

Almost surely, 2^{21405232073463} is an apocalyptic number.

21405232073463 is a deficient number, since it is larger than the sum of its proper divisors (14204949582729).

21405232073463 is a wasteful number, since it uses less digits than its factorization.

21405232073463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4891941 (or 4891917 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 42.

The spelling of 21405232073463 in words is "twenty-one trillion, four hundred five billion, two hundred thirty-two million, seventy-three thousand, four hundred sixty-three".