21163578347 has 8 divisors (see below), whose sum is σ = 22021678656. Its totient is φ = 20322470272.

The previous prime is 21163578287. The next prime is 21163578349. The reversal of 21163578347 is 74387536112.

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 21163578347 - 2⁶ = 21163578283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21163578349) 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, 4245518 + ... + 4250499.

It is an arithmetic number, because the mean of its divisors is an integer number (2752709832).

Almost surely, 2^21163578347 is an apocalyptic number.

21163578347 is a deficient number, since it is larger than the sum of its proper divisors (858100309).

21163578347 is an equidigital number, since it uses as much as digits as its factorization.

21163578347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496117.

The product of its digits is 846720, while the sum is 47.

It can be divided in two parts, 211635 and 78347, that added together give a palindrome (289982).

The spelling of 21163578347 in words is "twenty-one billion, one hundred sixty-three million, five hundred seventy-eight thousand, three hundred forty-seven".