21790749478623 has 8 divisors (see below), whose sum is σ = 29090246526000. Its totient is φ = 14509209375168.

The previous prime is 21790749478621. The next prime is 21790749478639. The reversal of 21790749478623 is 32687494709712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21790749478623 - 2¹ = 21790749478621 is a prime.

It is a super-3 number, since 3×21790749478623³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21790749478621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4489233148 + ... + 4489238001.

It is an arithmetic number, because the mean of its divisors is an integer number (3636280815750).

Almost surely, 2^{21790749478623} is an apocalyptic number.

21790749478623 is a deficient number, since it is larger than the sum of its proper divisors (7299497047377).

21790749478623 is an equidigital number, since it uses as much as digits as its factorization.

21790749478623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8978471961.

The product of its (nonzero) digits is 256048128, while the sum is 69.

The spelling of 21790749478623 in words is "twenty-one trillion, seven hundred ninety billion, seven hundred forty-nine million, four hundred seventy-eight thousand, six hundred twenty-three".