21436663413 has 16 divisors (see below), whose sum is σ = 31186022400. Its totient is φ = 12989658480.

The previous prime is 21436663411. The next prime is 21436663421. The reversal of 21436663413 is 31436663412.

It is not a de Polignac number, because 21436663413 - 2¹ = 21436663411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436663411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147178 + ... + 254036.

It is an arithmetic number, because the mean of its divisors is an integer number (1949126400).

Almost surely, 2^21436663413 is an apocalyptic number.

It is an amenable number.

21436663413 is a deficient number, since it is larger than the sum of its proper divisors (9749358987).

21436663413 is a wasteful number, since it uses less digits than its factorization.

21436663413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112952.

The product of its digits is 186624, while the sum is 39.

Subtracting 21436663413 from its reverse (31436663412), we obtain a palindrome (9999999999).

The spelling of 21436663413 in words is "twenty-one billion, four hundred thirty-six million, six hundred sixty-three thousand, four hundred thirteen".