21167947249 has 8 divisors (see below), whose sum is σ = 21690806720. Its totient is φ = 20646477936.

The previous prime is 21167947223. The next prime is 21167947289. The reversal of 21167947249 is 94274976112.

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 21167947249 - 2¹⁹ = 21167422961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21167947196 and 21167947205.

It is not an unprimeable number, because it can be changed into a prime (21167947289) 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, 316677 + ... + 377650.

It is an arithmetic number, because the mean of its divisors is an integer number (2711350840).

Almost surely, 2^21167947249 is an apocalyptic number.

It is an amenable number.

21167947249 is a deficient number, since it is larger than the sum of its proper divisors (522859471).

21167947249 is an equidigital number, since it uses as much as digits as its factorization.

21167947249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695079.

The product of its digits is 1524096, while the sum is 52.

The spelling of 21167947249 in words is "twenty-one billion, one hundred sixty-seven million, nine hundred forty-seven thousand, two hundred forty-nine".