21663536233125 has 80 divisors (see below), whose sum is σ = 36344945894400. Its totient is φ = 11473702368000.

The previous prime is 21663536233049. The next prime is 21663536233133. The reversal of 21663536233125 is 52133263536612.

It is a happy number.

It is not a de Polignac number, because 21663536233125 - 2¹⁵ = 21663536200357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2091675447 + ... + 2091685803.

It is an arithmetic number, because the mean of its divisors is an integer number (454311823680).

Almost surely, 2^{21663536233125} is an apocalyptic number.

21663536233125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21663536233125 is a deficient number, since it is larger than the sum of its proper divisors (14681409661275).

21663536233125 is a wasteful number, since it uses less digits than its factorization.

21663536233125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18016 (or 18001 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 48.

Adding to 21663536233125 its reverse (52133263536612), we get a palindrome (73796799769737).

The spelling of 21663536233125 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred thirty-six million, two hundred thirty-three thousand, one hundred twenty-five".