21212159129 has 8 divisors (see below), whose sum is σ = 24250355520. Its totient is φ = 18175934736.

The previous prime is 21212159117. The next prime is 21212159209. The reversal of 21212159129 is 92195121212.

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 21212159129 - 2⁸ = 21212158873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212159029) 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, 469874 + ... + 513035.

It is an arithmetic number, because the mean of its divisors is an integer number (3031294440).

Almost surely, 2^21212159129 is an apocalyptic number.

It is an amenable number.

21212159129 is a deficient number, since it is larger than the sum of its proper divisors (3038196391).

21212159129 is an equidigital number, since it uses as much as digits as its factorization.

21212159129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985999.

The product of its digits is 6480, while the sum is 35.

The spelling of 21212159129 in words is "twenty-one billion, two hundred twelve million, one hundred fifty-nine thousand, one hundred twenty-nine".