21202102201121 has 4 divisors (see below), whose sum is σ = 21369047887872. Its totient is φ = 21035156514372.

The previous prime is 21202102201099. The next prime is 21202102201139. The reversal of 21202102201121 is 12110220120212.

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-21202102201121 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 21202102201121.

It is not an unprimeable number, because it can be changed into a prime (21202102201151) 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, 83472843185 + ... + 83472843438.

It is an arithmetic number, because the mean of its divisors is an integer number (5342261971968).

Almost surely, 2^{21202102201121} is an apocalyptic number.

It is an amenable number.

21202102201121 is a deficient number, since it is larger than the sum of its proper divisors (166945686751).

21202102201121 is a wasteful number, since it uses less digits than its factorization.

21202102201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166945686750.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21202102201121 its reverse (12110220120212), we get a palindrome (33312322321333).

The spelling of 21202102201121 in words is "twenty-one trillion, two hundred two billion, one hundred two million, two hundred one thousand, one hundred twenty-one".