21623817239639 has 8 divisors (see below), whose sum is σ = 21807706074000. Its totient is φ = 21440333002752.

The previous prime is 21623817239533. The next prime is 21623817239641. The reversal of 21623817239639 is 93693271832612.

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

It is a cyclic number.

It is not a de Polignac number, because 21623817239639 - 2¹⁶ = 21623817174103 is a prime.

It is a super-3 number, since 3×21623817239639³ (a number of 41 digits) contains 333 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 (21623817299639) 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 7 ways as a sum of consecutive naturals, for example, 101042024 + ... + 101255805.

It is an arithmetic number, because the mean of its divisors is an integer number (2725963259250).

Almost surely, 2^{21623817239639} is an apocalyptic number.

21623817239639 is a deficient number, since it is larger than the sum of its proper divisors (183888834361).

21623817239639 is a wasteful number, since it uses less digits than its factorization.

21623817239639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202298737.

The product of its digits is 35271936, while the sum is 62.

The spelling of 21623817239639 in words is "twenty-one trillion, six hundred twenty-three billion, eight hundred seventeen million, two hundred thirty-nine thousand, six hundred thirty-nine".