21120310220101 has 4 divisors (see below), whose sum is σ = 21125604861900. Its totient is φ = 21115015578304.

The previous prime is 21120310220081. The next prime is 21120310220129. The reversal of 21120310220101 is 10102201302112.

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 15636891831201 + 5483418388900 = 3954351^2 + 2341670^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120310220101 - 2²⁹ = 21119773349189 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 (21120310280101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2647314916 + ... + 2647322893.

It is an arithmetic number, because the mean of its divisors is an integer number (5281401215475).

Almost surely, 2^{21120310220101} is an apocalyptic number.

It is an amenable number.

21120310220101 is a deficient number, since it is larger than the sum of its proper divisors (5294641799).

21120310220101 is an equidigital number, since it uses as much as digits as its factorization.

21120310220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5294641798.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21120310220101 its reverse (10102201302112), we get a palindrome (31222511522213).

The spelling of 21120310220101 in words is "twenty-one trillion, one hundred twenty billion, three hundred ten million, two hundred twenty thousand, one hundred one".