21116108429 has 8 divisors (see below), whose sum is σ = 22748314680. Its totient is φ = 19485029376.

The previous prime is 21116108423. The next prime is 21116108449. The reversal of 21116108429 is 92480161112.

It can be written as a sum of positive squares in 4 ways, for example, as 789048100 + 20327060329 = 28090^2 + 142573^2 .

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 21116108429 - 2¹² = 21116104333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116108423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242684 + ... + 318005.

It is an arithmetic number, because the mean of its divisors is an integer number (2843539335).

Almost surely, 2^21116108429 is an apocalyptic number.

It is an amenable number.

21116108429 is a deficient number, since it is larger than the sum of its proper divisors (1632206251).

21116108429 is a wasteful number, since it uses less digits than its factorization.

21116108429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563599.

The product of its (nonzero) digits is 6912, while the sum is 35.

The spelling of 21116108429 in words is "twenty-one billion, one hundred sixteen million, one hundred eight thousand, four hundred twenty-nine".