21229429567871 has 16 divisors (see below), whose sum is σ = 26363007375360. Its totient is φ = 16682840598240.

The previous prime is 21229429567817. The next prime is 21229429567883. The reversal of 21229429567871 is 17876592492212.

It is a cyclic number.

It is not a de Polignac number, because 21229429567871 - 2³⁴ = 21212249698687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21229429567798 and 21229429567807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21229429567891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2574508316 + ... + 2574516561.

It is an arithmetic number, because the mean of its divisors is an integer number (1647687960960).

Almost surely, 2^{21229429567871} is an apocalyptic number.

21229429567871 is a deficient number, since it is larger than the sum of its proper divisors (5133577807489).

21229429567871 is a wasteful number, since it uses less digits than its factorization.

21229429567871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5149024934.

The product of its digits is 60963840, while the sum is 65.

The spelling of 21229429567871 in words is "twenty-one trillion, two hundred twenty-nine billion, four hundred twenty-nine million, five hundred sixty-seven thousand, eight hundred seventy-one".