21202221201101 has 4 divisors (see below), whose sum is σ = 21518672263872. Its totient is φ = 20885770138332.

The previous prime is 21202221201053. The next prime is 21202221201127. The reversal of 21202221201101 is 10110212220212.

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-21202221201101 is a prime.

It is a super-2 number, since 2×21202221201101² (a number of 27 digits) contains 22 as substring.

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 21202221201101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202221200101) 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, 158225531285 + ... + 158225531418.

It is an arithmetic number, because the mean of its divisors is an integer number (5379668065968).

Almost surely, 2^{21202221201101} is an apocalyptic number.

It is an amenable number.

21202221201101 is a deficient number, since it is larger than the sum of its proper divisors (316451062771).

21202221201101 is an equidigital number, since it uses as much as digits as its factorization.

21202221201101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316451062770.

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

Adding to 21202221201101 its reverse (10110212220212), we get a palindrome (31312433421313).

The spelling of 21202221201101 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-one million, two hundred one thousand, one hundred one".