21202101211121 has 8 divisors (see below), whose sum is σ = 21305455909920. Its totient is φ = 21098852141472.

The previous prime is 21202101211061. The next prime is 21202101211183. The reversal of 21202101211121 is 12111210120212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202101211121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202101211121.

It is not an unprimeable number, because it can be changed into a prime (21202101219121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26004851 + ... + 26807768.

It is an arithmetic number, because the mean of its divisors is an integer number (2663181988740).

Almost surely, 2^{21202101211121} is an apocalyptic number.

It is an amenable number.

21202101211121 is a deficient number, since it is larger than the sum of its proper divisors (103354698799).

21202101211121 is a wasteful number, since it uses less digits than its factorization.

21202101211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52814575.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21202101211121 its reverse (12111210120212), we get a palindrome (33313311331333).

The spelling of 21202101211121 in words is "twenty-one trillion, two hundred two billion, one hundred one million, two hundred eleven thousand, one hundred twenty-one".