21435544215463 has 32 divisors (see below), whose sum is σ = 25969244184576. Its totient is φ = 17296721822688.

The previous prime is 21435544215457. The next prime is 21435544215469. The reversal of 21435544215463 is 36451244553412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21435544215457) and next prime (21435544215469).

It is a de Polignac number, because none of the positive numbers 2^k-21435544215463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435544215469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 464856 + ... + 6564082.

It is an arithmetic number, because the mean of its divisors is an integer number (811538880768).

Almost surely, 2^{21435544215463} is an apocalyptic number.

21435544215463 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21435544215463 is a deficient number, since it is larger than the sum of its proper divisors (4533699969113).

21435544215463 is a wasteful number, since it uses less digits than its factorization.

21435544215463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6099603.

The product of its digits is 6912000, while the sum is 49.

Adding to 21435544215463 its reverse (36451244553412), we get a palindrome (57886788768875).

The spelling of 21435544215463 in words is "twenty-one trillion, four hundred thirty-five billion, five hundred forty-four million, two hundred fifteen thousand, four hundred sixty-three".