21382723887073 has 4 divisors (see below), whose sum is σ = 21382944472240. Its totient is φ = 21382503301908.

The previous prime is 21382723887071. The next prime is 21382723887097. The reversal of 21382723887073 is 37078832728312.

It is a happy number.

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 21382723887073 - 2¹ = 21382723887071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21382723887071) 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, 110147115 + ... + 110341072.

It is an arithmetic number, because the mean of its divisors is an integer number (5345736118060).

Almost surely, 2^{21382723887073} is an apocalyptic number.

It is an amenable number.

21382723887073 is a deficient number, since it is larger than the sum of its proper divisors (220585167).

21382723887073 is an equidigital number, since it uses as much as digits as its factorization.

21382723887073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220585166.

The product of its (nonzero) digits is 37933056, while the sum is 61.

The spelling of 21382723887073 in words is "twenty-one trillion, three hundred eighty-two billion, seven hundred twenty-three million, eight hundred eighty-seven thousand, seventy-three".