21438007463 has 4 divisors (see below), whose sum is σ = 22370094768. Its totient is φ = 20505920160.

The previous prime is 21438007453. The next prime is 21438007483. The reversal of 21438007463 is 36470083412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21438007463 - 2²⁰ = 21436958887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21438007433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466043618 + ... + 466043663.

It is an arithmetic number, because the mean of its divisors is an integer number (5592523692).

Almost surely, 2^21438007463 is an apocalyptic number.

21438007463 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21438007463 is a deficient number, since it is larger than the sum of its proper divisors (932087305).

21438007463 is an equidigital number, since it uses as much as digits as its factorization.

21438007463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932087304.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 21438007463 in words is "twenty-one billion, four hundred thirty-eight million, seven thousand, four hundred sixty-three".