21312311129 has 8 divisors (see below), whose sum is σ = 22254486912. Its totient is φ = 20371431520.

The previous prime is 21312311123. The next prime is 21312311161. The reversal of 21312311129 is 92111321312.

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 21312311129 - 2¹⁶ = 21312245593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312311098 and 21312311107.

It is not an unprimeable number, because it can be changed into a prime (21312311123) 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 7 ways as a sum of consecutive naturals, for example, 290357 + ... + 356274.

It is an arithmetic number, because the mean of its divisors is an integer number (2781810864).

Almost surely, 2^21312311129 is an apocalyptic number.

It is an amenable number.

21312311129 is a deficient number, since it is larger than the sum of its proper divisors (942175783).

21312311129 is a wasteful number, since it uses less digits than its factorization.

21312311129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648087.

The product of its digits is 648, while the sum is 26.

The spelling of 21312311129 in words is "twenty-one billion, three hundred twelve million, three hundred eleven thousand, one hundred twenty-nine".