21110122221101 has 8 divisors (see below), whose sum is σ = 21207329685240. Its totient is φ = 21013065819648.

The previous prime is 21110122221079. The next prime is 21110122221107. The reversal of 21110122221101 is 10112222101112.

It can be written as a sum of positive squares in 4 ways, for example, as 1089464163076 + 20020658058025 = 1043774^2 + 4474445^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21110122221101 - 2⁶ = 21110122221037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110122221101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110122221107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37485536 + ... + 38044521.

It is an arithmetic number, because the mean of its divisors is an integer number (2650916210655).

Almost surely, 2^{21110122221101} is an apocalyptic number.

It is an amenable number.

21110122221101 is a deficient number, since it is larger than the sum of its proper divisors (97207464139).

21110122221101 is a wasteful number, since it uses less digits than its factorization.

21110122221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75531343.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21110122221101 its reverse (10112222101112), we get a palindrome (31222344322213).

The spelling of 21110122221101 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred one".