21413547447 has 8 divisors (see below), whose sum is σ = 30054101760. Its totient is φ = 13524345720.

The previous prime is 21413547443. The next prime is 21413547451. The reversal of 21413547447 is 74474531412.

It is an interprime number because it is at equal distance from previous prime (21413547443) and next prime (21413547451).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21413547447 - 2² = 21413547443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21413547399 and 21413547408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21413547443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187838079 + ... + 187838192.

It is an arithmetic number, because the mean of its divisors is an integer number (3756762720).

Almost surely, 2^21413547447 is an apocalyptic number.

21413547447 is a deficient number, since it is larger than the sum of its proper divisors (8640554313).

21413547447 is a wasteful number, since it uses less digits than its factorization.

21413547447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375676293.

The product of its digits is 376320, while the sum is 42.

The spelling of 21413547447 in words is "twenty-one billion, four hundred thirteen million, five hundred forty-seven thousand, four hundred forty-seven".