21403340029 has 8 divisors (see below), whose sum is σ = 21446624600. Its totient is φ = 21360096576.

The previous prime is 21403340009. The next prime is 21403340033. The reversal of 21403340029 is 92004330412.

It can be written as a sum of positive squares in 4 ways, for example, as 235225 + 21403104804 = 485^2 + 146298^2 .

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 21403340029 - 2¹¹ = 21403337981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21403339979 and 21403340006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403340009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1163467 + ... + 1181719.

It is an arithmetic number, because the mean of its divisors is an integer number (2680828075).

Almost surely, 2^21403340029 is an apocalyptic number.

It is an amenable number.

21403340029 is a deficient number, since it is larger than the sum of its proper divisors (43284571).

21403340029 is a wasteful number, since it uses less digits than its factorization.

21403340029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20559.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 21403340029 in words is "twenty-one billion, four hundred three million, three hundred forty thousand, twenty-nine".