21201211121101 has 4 divisors (see below), whose sum is σ = 23128593950304. Its totient is φ = 19273828291900.

The previous prime is 21201211121071. The next prime is 21201211121131. The reversal of 21201211121101 is 10112111210212.

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 an interprime number because it is at equal distance from previous prime (21201211121071) and next prime (21201211121131).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201211121101 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 (21201211121131) 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, 963691414585 + ... + 963691414606.

It is an arithmetic number, because the mean of its divisors is an integer number (5782148487576).

Almost surely, 2^{21201211121101} is an apocalyptic number.

It is an amenable number.

21201211121101 is a deficient number, since it is larger than the sum of its proper divisors (1927382829203).

21201211121101 is a wasteful number, since it uses less digits than its factorization.

21201211121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927382829202.

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

Adding to 21201211121101 its reverse (10112111210212), we get a palindrome (31313322331313).

It can be divided in two parts, 21201211 and 121101, that added together give a palindrome (21322312).

The spelling of 21201211121101 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred one".