21101122110066 has 64 divisors (see below), whose sum is σ = 46356955084800. Its totient is φ = 6373507320576.

The previous prime is 21101122109999. The next prime is 21101122110067. The reversal of 21101122110066 is 66001122110112.

It is not an unprimeable number, because it can be changed into a prime (21101122110067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62147770 + ... + 62486378.

It is an arithmetic number, because the mean of its divisors is an integer number (724327423200).

Almost surely, 2^{21101122110066} is an apocalyptic number.

21101122110066 is an abundant number, since it is smaller than the sum of its proper divisors (25255832974734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101122110066 is a wasteful number, since it uses less digits than its factorization.

21101122110066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362423.

The product of its (nonzero) digits is 288, while the sum is 24.

Adding to 21101122110066 its reverse (66001122110112), we get a palindrome (87102244220178).

The spelling of 21101122110066 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-two million, one hundred ten thousand, sixty-six".