21398033405 has 8 divisors (see below), whose sum is σ = 29345874432. Its totient is φ = 14672937168.

The previous prime is 21398033381. The next prime is 21398033407. The reversal of 21398033405 is 50433089312.

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 21398033405 - 2¹² = 21398029309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21398033407) 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, 305686157 + ... + 305686226.

It is an arithmetic number, because the mean of its divisors is an integer number (3668234304).

Almost surely, 2^21398033405 is an apocalyptic number.

It is an amenable number.

21398033405 is a deficient number, since it is larger than the sum of its proper divisors (7947841027).

21398033405 is an equidigital number, since it uses as much as digits as its factorization.

21398033405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611372395.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 21398033405 in words is "twenty-one billion, three hundred ninety-eight million, thirty-three thousand, four hundred five".