21041804397 has 8 divisors (see below), whose sum is σ = 28333519200. Its totient is φ = 13888979600.

The previous prime is 21041804363. The next prime is 21041804401. The reversal of 21041804397 is 79340814012.

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 21041804397 - 2¹² = 21041800301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041804897) 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, 34722147 + ... + 34722752.

It is an arithmetic number, because the mean of its divisors is an integer number (3541689900).

Almost surely, 2^21041804397 is an apocalyptic number.

It is an amenable number.

21041804397 is a deficient number, since it is larger than the sum of its proper divisors (7291714803).

21041804397 is a wasteful number, since it uses less digits than its factorization.

21041804397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69445003.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 21041804397 in words is "twenty-one billion, forty-one million, eight hundred four thousand, three hundred ninety-seven".