21500231670623 has 4 divisors (see below), whose sum is σ = 22241618969640. Its totient is φ = 20758844371608.

The previous prime is 21500231670607. The next prime is 21500231670677. The reversal of 21500231670623 is 32607613200512.

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 21500231670623 - 2⁴ = 21500231670607 is a prime.

It is a super-2 number, since 2×21500231670623² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500231670823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370693649465 + ... + 370693649522.

It is an arithmetic number, because the mean of its divisors is an integer number (5560404742410).

Almost surely, 2^{21500231670623} is an apocalyptic number.

21500231670623 is a deficient number, since it is larger than the sum of its proper divisors (741387299017).

21500231670623 is an equidigital number, since it uses as much as digits as its factorization.

21500231670623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741387299016.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 21500231670623 in words is "twenty-one trillion, five hundred billion, two hundred thirty-one million, six hundred seventy thousand, six hundred twenty-three".