21663535324101 has 8 divisors (see below), whose sum is σ = 31510596835104. Its totient is φ = 13129415347920.

The previous prime is 21663535324069. The next prime is 21663535324127. The reversal of 21663535324101 is 10142353536612.

It is a happy number.

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

It is not a de Polignac number, because 21663535324101 - 2⁵ = 21663535324069 is a prime.

It is a super-2 number, since 2×21663535324101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663535324901) 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, 328235383666 + ... + 328235383731.

It is an arithmetic number, because the mean of its divisors is an integer number (3938824604388).

Almost surely, 2^{21663535324101} is an apocalyptic number.

It is an amenable number.

21663535324101 is a deficient number, since it is larger than the sum of its proper divisors (9847061511003).

21663535324101 is a wasteful number, since it uses less digits than its factorization.

21663535324101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656470767411.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 21663535324101 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred thirty-five million, three hundred twenty-four thousand, one hundred one".