21004493937 has 8 divisors (see below), whose sum is σ = 32006847936. Its totient is φ = 12002567952.

The previous prime is 21004493927. The next prime is 21004493947. The reversal of 21004493937 is 73939440012.

It is an interprime number because it is at equal distance from previous prime (21004493927) and next prime (21004493947).

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

It is not a de Polignac number, because 21004493937 - 2⁴ = 21004493921 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21004493927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500106978 + ... + 500107019.

It is an arithmetic number, because the mean of its divisors is an integer number (4000855992).

Almost surely, 2^21004493937 is an apocalyptic number.

It is an amenable number.

21004493937 is a deficient number, since it is larger than the sum of its proper divisors (11002353999).

21004493937 is a wasteful number, since it uses less digits than its factorization.

21004493937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000214007.

The product of its (nonzero) digits is 163296, while the sum is 42.

The spelling of 21004493937 in words is "twenty-one billion, four million, four hundred ninety-three thousand, nine hundred thirty-seven".