21409352733 has 8 divisors (see below), whose sum is σ = 28546559296. Its totient is φ = 14272524000.

The previous prime is 21409352717. The next prime is 21409352749. The reversal of 21409352733 is 33725390412.

It is an interprime number because it is at equal distance from previous prime (21409352717) and next prime (21409352749).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21409352733 - 2⁴ = 21409352717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21409352691 and 21409352700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21409352233) 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, 88248 + ... + 224958.

It is an arithmetic number, because the mean of its divisors is an integer number (3568319912).

Almost surely, 2^21409352733 is an apocalyptic number.

It is an amenable number.

21409352733 is a deficient number, since it is larger than the sum of its proper divisors (7137206563).

21409352733 is a wasteful number, since it uses less digits than its factorization.

21409352733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188915.

The product of its (nonzero) digits is 136080, while the sum is 39.

The spelling of 21409352733 in words is "twenty-one billion, four hundred nine million, three hundred fifty-two thousand, seven hundred thirty-three".