210021111200101 has 4 divisors (see below), whose sum is σ = 210534610249900. Its totient is φ = 209507612150304.

The previous prime is 210021111200099. The next prime is 210021111200111. The reversal of 210021111200101 is 101002111120012.

It is a happy number.

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 152598437249476 + 57422673950625 = 12353074^2 + 7577775^2 .

It is a cyclic number.

It is not a de Polignac number, because 210021111200101 - 2¹ = 210021111200099 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 (210021111200111) 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, 256749524286 + ... + 256749525103.

It is an arithmetic number, because the mean of its divisors is an integer number (52633652562475).

Almost surely, 2^{210021111200101} is an apocalyptic number.

It is an amenable number.

210021111200101 is a deficient number, since it is larger than the sum of its proper divisors (513499049799).

210021111200101 is an equidigital number, since it uses as much as digits as its factorization.

210021111200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513499049798.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210021111200101 its reverse (101002111120012), we get a palindrome (311023222320113).

The spelling of 210021111200101 in words is "two hundred ten trillion, twenty-one billion, one hundred eleven million, two hundred thousand, one hundred one".