21110201222021 has 4 divisors (see below), whose sum is σ = 21136295414700. Its totient is φ = 21084107029344.

The previous prime is 21110201222003. The next prime is 21110201222023. The reversal of 21110201222021 is 12022210201112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9091949661796 + 12018251560225 = 3015286^2 + 3466735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110201222021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110201222023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13047095126 + ... + 13047096743.

It is an arithmetic number, because the mean of its divisors is an integer number (5284073853675).

Almost surely, 2^{21110201222021} is an apocalyptic number.

It is an amenable number.

21110201222021 is a deficient number, since it is larger than the sum of its proper divisors (26094192679).

21110201222021 is an equidigital number, since it uses as much as digits as its factorization.

21110201222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26094192678.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21110201222021 its reverse (12022210201112), we get a palindrome (33132411423133).

The spelling of 21110201222021 in words is "twenty-one trillion, one hundred ten billion, two hundred one million, two hundred twenty-two thousand, twenty-one".