21438692237639 has 8 divisors (see below), whose sum is σ = 21612736809312. Its totient is φ = 21265069593600.

The previous prime is 21438692237597. The next prime is 21438692237657. The reversal of 21438692237639 is 93673229683412.

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 21438692237639 - 2³² = 21434397270343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21438692237659) 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, 105379874 + ... + 105583119.

It is an arithmetic number, because the mean of its divisors is an integer number (2701592101164).

Almost surely, 2^{21438692237639} is an apocalyptic number.

21438692237639 is a deficient number, since it is larger than the sum of its proper divisors (174044571673).

21438692237639 is a wasteful number, since it uses less digits than its factorization.

21438692237639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210963817.

The product of its digits is 141087744, while the sum is 65.

The spelling of 21438692237639 in words is "twenty-one trillion, four hundred thirty-eight billion, six hundred ninety-two million, two hundred thirty-seven thousand, six hundred thirty-nine".