21001110210001 has 4 divisors (see below), whose sum is σ = 21001167441904. Its totient is φ = 21001052978100.

The previous prime is 21001110209993. The next prime is 21001110210029. The reversal of 21001110210001 is 10001201110012.

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 21001110210001 - 2³ = 21001110209993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21001110210001.

It is not an unprimeable number, because it can be changed into a prime (21001110211001) 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, 28061955 + ... + 28800616.

It is an arithmetic number, because the mean of its divisors is an integer number (5250291860476).

Almost surely, 2^{21001110210001} is an apocalyptic number.

It is an amenable number.

21001110210001 is a deficient number, since it is larger than the sum of its proper divisors (57231903).

21001110210001 is an equidigital number, since it uses as much as digits as its factorization.

21001110210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57231902.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001110210001 its reverse (10001201110012), we get a palindrome (31002311320013).

The spelling of 21001110210001 in words is "twenty-one trillion, one billion, one hundred ten million, two hundred ten thousand, one".