21210201021101 has 4 divisors (see below), whose sum is σ = 21211159523100. Its totient is φ = 21209242519104.

The previous prime is 21210201021029. The next prime is 21210201021143. The reversal of 21210201021101 is 10112010201212.

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 8521430884201 + 12688770136900 = 2919149^2 + 3562130^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210201021101 - 2³⁴ = 21193021151917 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 (21210201021151) 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, 479217806 + ... + 479262063.

It is an arithmetic number, because the mean of its divisors is an integer number (5302789880775).

Almost surely, 2^{21210201021101} is an apocalyptic number.

It is an amenable number.

21210201021101 is a deficient number, since it is larger than the sum of its proper divisors (958501999).

21210201021101 is an equidigital number, since it uses as much as digits as its factorization.

21210201021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958501998.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210201021101 its reverse (10112010201212), we get a palindrome (31322211222313).

The spelling of 21210201021101 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, twenty-one thousand, one hundred one".