21655054112523 has 24 divisors (see below), whose sum is σ = 31330557573120. Its totient is φ = 13298366147040.

The previous prime is 21655054112473. The next prime is 21655054112539. The reversal of 21655054112523 is 32521145055612.

It is a happy number.

It is not a de Polignac number, because 21655054112523 - 2⁸ = 21655054112267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21655054112563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44341843 + ... + 44827548.

It is an arithmetic number, because the mean of its divisors is an integer number (1305439898880).

Almost surely, 2^{21655054112523} is an apocalyptic number.

21655054112523 is a deficient number, since it is larger than the sum of its proper divisors (9675503460597).

21655054112523 is a wasteful number, since it uses less digits than its factorization.

21655054112523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89169899 (or 89169886 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 42.

The spelling of 21655054112523 in words is "twenty-one trillion, six hundred fifty-five billion, fifty-four million, one hundred twelve thousand, five hundred twenty-three".