21623005211673 has 4 divisors (see below), whose sum is σ = 28830673615568. Its totient is φ = 14415336807780.

The previous prime is 21623005211627. The next prime is 21623005211693. The reversal of 21623005211673 is 37611250032612.

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 not a de Polignac number, because 21623005211673 - 2²⁰ = 21623004163097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21623005211693) 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, 3603834201943 + ... + 3603834201948.

It is an arithmetic number, because the mean of its divisors is an integer number (7207668403892).

Almost surely, 2^{21623005211673} is an apocalyptic number.

It is an amenable number.

21623005211673 is a deficient number, since it is larger than the sum of its proper divisors (7207668403895).

21623005211673 is an equidigital number, since it uses as much as digits as its factorization.

21623005211673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7207668403894.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 21623005211673 in words is "twenty-one trillion, six hundred twenty-three billion, five million, two hundred eleven thousand, six hundred seventy-three".