21010220221101 has 4 divisors (see below), whose sum is σ = 28013626961472. Its totient is φ = 14006813480732.

The previous prime is 21010220221061. The next prime is 21010220221139. The reversal of 21010220221101 is 10112202201012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21010220221101 - 2²¹ = 21010218123949 is a prime.

It is a super-2 number, since 2×21010220221101² (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 (21010220021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3501703370181 + ... + 3501703370186.

It is an arithmetic number, because the mean of its divisors is an integer number (7003406740368).

Almost surely, 2^{21010220221101} is an apocalyptic number.

It is an amenable number.

21010220221101 is a deficient number, since it is larger than the sum of its proper divisors (7003406740371).

21010220221101 is an equidigital number, since it uses as much as digits as its factorization.

21010220221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7003406740370.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21010220221101 its reverse (10112202201012), we get a palindrome (31122422422113).

The spelling of 21010220221101 in words is "twenty-one trillion, ten billion, two hundred twenty million, two hundred twenty-one thousand, one hundred one".