21104620493 has 4 divisors (see below), whose sum is σ = 23023222368. Its totient is φ = 19186018620.

The previous prime is 21104620487. The next prime is 21104620501. The reversal of 21104620493 is 39402640112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21104620493 - 2⁴ = 21104620477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104620423) 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 3 ways as a sum of consecutive naturals, for example, 959300921 + ... + 959300942.

It is an arithmetic number, because the mean of its divisors is an integer number (5755805592).

Almost surely, 2^21104620493 is an apocalyptic number.

It is an amenable number.

21104620493 is a deficient number, since it is larger than the sum of its proper divisors (1918601875).

21104620493 is a wasteful number, since it uses less digits than its factorization.

21104620493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918601874.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21104620493 in words is "twenty-one billion, one hundred four million, six hundred twenty thousand, four hundred ninety-three".