21633287891606 has 32 divisors (see below), whose sum is σ = 33404388982272. Its totient is φ = 10502212200480.

The previous prime is 21633287891603. The next prime is 21633287891629. The reversal of 21633287891606 is 60619878233612.

It is a super-2 number, since 2×21633287891606² (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 (21633287891603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37108385 + ... + 37686851.

It is an arithmetic number, because the mean of its divisors is an integer number (1043887155696).

Almost surely, 2^{21633287891606} is an apocalyptic number.

21633287891606 is a deficient number, since it is larger than the sum of its proper divisors (11771101090666).

21633287891606 is a wasteful number, since it uses less digits than its factorization.

21633287891606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581684.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 21633287891606 in words is "twenty-one trillion, six hundred thirty-three billion, two hundred eighty-seven million, eight hundred ninety-one thousand, six hundred six".