21101112220101 has 64 divisors (see below), whose sum is σ = 29881234768896. Its totient is φ = 13227063091200.

The previous prime is 21101112220099. The next prime is 21101112220163. The reversal of 21101112220101 is 10102221110112.

It is a happy number.

It is not a de Polignac number, because 21101112220101 - 2¹ = 21101112220099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101112220171) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 213315085 + ... + 213413981.

It is an arithmetic number, because the mean of its divisors is an integer number (466894293264).

Almost surely, 2^{21101112220101} is an apocalyptic number.

It is an amenable number.

21101112220101 is a deficient number, since it is larger than the sum of its proper divisors (8780122548795).

21101112220101 is a wasteful number, since it uses less digits than its factorization.

21101112220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99422.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21101112220101 its reverse (10102221110112), we get a palindrome (31203333330213).

The spelling of 21101112220101 in words is "twenty-one trillion, one hundred one billion, one hundred twelve million, two hundred twenty thousand, one hundred one".