21011000111201 has 4 divisors (see below), whose sum is σ = 21306929690304. Its totient is φ = 20715070532100.

The previous prime is 21011000111191. The next prime is 21011000111347. The reversal of 21011000111201 is 10211100011012.

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 a de Polignac number, because none of the positive numbers 2^k-21011000111201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011000119201) 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, 147964789445 + ... + 147964789586.

It is an arithmetic number, because the mean of its divisors is an integer number (5326732422576).

Almost surely, 2^{21011000111201} is an apocalyptic number.

It is an amenable number.

21011000111201 is a deficient number, since it is larger than the sum of its proper divisors (295929579103).

21011000111201 is an equidigital number, since it uses as much as digits as its factorization.

21011000111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295929579102.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21011000111201 its reverse (10211100011012), we get a palindrome (31222100122213).

The spelling of 21011000111201 in words is "twenty-one trillion, eleven billion, one hundred eleven thousand, two hundred one".