21202022202221 has 16 divisors (see below), whose sum is σ = 24269351957760. Its totient is φ = 18144322600320.

The previous prime is 21202022202199. The next prime is 21202022202241. The reversal of 21202022202221 is 12220222020212.

It is a de Polignac number, because none of the positive numbers 2^k-21202022202221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202022202193 and 21202022202202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202022202241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19441136 + ... + 20502726.

It is an arithmetic number, because the mean of its divisors is an integer number (1516834497360).

Almost surely, 2^{21202022202221} is an apocalyptic number.

It is an amenable number.

21202022202221 is a deficient number, since it is larger than the sum of its proper divisors (3067329755539).

21202022202221 is a wasteful number, since it uses less digits than its factorization.

21202022202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066124.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21202022202221 its reverse (12220222020212), we get a palindrome (33422244222433).

The spelling of 21202022202221 in words is "twenty-one trillion, two hundred two billion, twenty-two million, two hundred two thousand, two hundred twenty-one".