21171237479069 has 8 divisors (see below), whose sum is σ = 21219172920288. Its totient is φ = 21123342408400.

The previous prime is 21171237479033. The next prime is 21171237479087. The reversal of 21171237479069 is 96097473217112.

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 21171237479069 - 2¹⁶ = 21171237413533 is a prime.

It is a super-2 number, since 2×21171237479069² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21171237478999 and 21171237479017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21171237479099) 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, 9042482 + ... + 11140419.

It is an arithmetic number, because the mean of its divisors is an integer number (2652396615036).

Almost surely, 2^{21171237479069} is an apocalyptic number.

It is an amenable number.

21171237479069 is a deficient number, since it is larger than the sum of its proper divisors (47935441219).

21171237479069 is a wasteful number, since it uses less digits than its factorization.

21171237479069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20185275.

The product of its (nonzero) digits is 8001504, while the sum is 59.

The spelling of 21171237479069 in words is "twenty-one trillion, one hundred seventy-one billion, two hundred thirty-seven million, four hundred seventy-nine thousand, sixty-nine".