21171052067 has 8 divisors (see below), whose sum is σ = 23097150000. Its totient is φ = 19245196960.

The previous prime is 21171052027. The next prime is 21171052087. The reversal of 21171052067 is 76025017112.

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

It is not a de Polignac number, because 21171052067 - 2¹⁰ = 21171051043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21171052027) 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, 154913 + ... + 257565.

It is an arithmetic number, because the mean of its divisors is an integer number (2887143750).

Almost surely, 2^21171052067 is an apocalyptic number.

21171052067 is a deficient number, since it is larger than the sum of its proper divisors (1926097933).

21171052067 is a wasteful number, since it uses less digits than its factorization.

21171052067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121413.

The product of its (nonzero) digits is 5880, while the sum is 32.

Adding to 21171052067 its reverse (76025017112), we get a palindrome (97196069179).

The spelling of 21171052067 in words is "twenty-one billion, one hundred seventy-one million, fifty-two thousand, sixty-seven".