21125167329 has 16 divisors (see below), whose sum is σ = 32256846848. Its totient is φ = 12046730832.

The previous prime is 21125167321. The next prime is 21125167333. The reversal of 21125167329 is 92376152112.

It is not a de Polignac number, because 21125167329 - 2³ = 21125167321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21125167321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1022587 + ... + 1043040.

It is an arithmetic number, because the mean of its divisors is an integer number (2016052928).

Almost surely, 2^21125167329 is an apocalyptic number.

It is an amenable number.

21125167329 is a deficient number, since it is larger than the sum of its proper divisors (11131679519).

21125167329 is a wasteful number, since it uses less digits than its factorization.

21125167329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066124.

The product of its digits is 45360, while the sum is 39.

The spelling of 21125167329 in words is "twenty-one billion, one hundred twenty-five million, one hundred sixty-seven thousand, three hundred twenty-nine".