21523118102638 has 8 divisors (see below), whose sum is σ = 32284800599688. Its totient is φ = 10761517902744.

The previous prime is 21523118102623. The next prime is 21523118102669. The reversal of 21523118102638 is 83620181132512.

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

It is a super-2 number, since 2×21523118102638² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21523118102594 and 21523118102603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19916256 + ... + 20969107.

It is an arithmetic number, because the mean of its divisors is an integer number (4035600074961).

Almost surely, 2^{21523118102638} is an apocalyptic number.

21523118102638 is a deficient number, since it is larger than the sum of its proper divisors (10761682497050).

21523118102638 is a wasteful number, since it uses less digits than its factorization.

21523118102638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41148578.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 21523118102638 in words is "twenty-one trillion, five hundred twenty-three billion, one hundred eighteen million, one hundred two thousand, six hundred thirty-eight".