21202222211021 has 8 divisors (see below), whose sum is σ = 22318178889600. Its totient is φ = 20086270557120.

The previous prime is 21202222211017. The next prime is 21202222211111. The reversal of 21202222211021 is 12011222220212.

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

It is a cyclic number.

It is not a de Polignac number, because 21202222211021 - 2² = 21202222211017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202222210984 and 21202222211002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202222201021) 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, 9984245 + ... + 11920133.

It is an arithmetic number, because the mean of its divisors is an integer number (2789772361200).

Almost surely, 2^{21202222211021} is an apocalyptic number.

It is an amenable number.

21202222211021 is a deficient number, since it is larger than the sum of its proper divisors (1115956678579).

21202222211021 is a wasteful number, since it uses less digits than its factorization.

21202222211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512339.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21202222211021 its reverse (12011222220212), we get a palindrome (33213444431233).

The spelling of 21202222211021 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-two million, two hundred eleven thousand, twenty-one".