21469731847 has 8 divisors (see below), whose sum is σ = 21500600400. Its totient is φ = 21438884544.

The previous prime is 21469731841. The next prime is 21469731863. The reversal of 21469731847 is 74813796412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21469731847 - 2²⁷ = 21335514119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21469731794 and 21469731803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21469731841) 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 7 ways as a sum of consecutive naturals, for example, 3450283 + ... + 3456499.

It is an arithmetic number, because the mean of its divisors is an integer number (2687575050).

Almost surely, 2^21469731847 is an apocalyptic number.

21469731847 is a deficient number, since it is larger than the sum of its proper divisors (30868553).

21469731847 is a wasteful number, since it uses less digits than its factorization.

21469731847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10625.

The product of its digits is 2032128, while the sum is 52.

The spelling of 21469731847 in words is "twenty-one billion, four hundred sixty-nine million, seven hundred thirty-one thousand, eight hundred forty-seven".