21717673403 has 4 divisors (see below), whose sum is σ = 21739903320. Its totient is φ = 21695443488.

The previous prime is 21717673361. The next prime is 21717673421. The reversal of 21717673403 is 30437671712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21717673403 - 2⁶ = 21717673339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21717676403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11113493 + ... + 11115446.

It is an arithmetic number, because the mean of its divisors is an integer number (5434975830).

Almost surely, 2^21717673403 is an apocalyptic number.

21717673403 is a deficient number, since it is larger than the sum of its proper divisors (22229917).

21717673403 is an equidigital number, since it uses as much as digits as its factorization.

21717673403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22229916.

The product of its (nonzero) digits is 148176, while the sum is 41.

The spelling of 21717673403 in words is "twenty-one billion, seven hundred seventeen million, six hundred seventy-three thousand, four hundred three".