21202002211 has 8 divisors (see below), whose sum is σ = 22881824784.
Its totient is φ = 19529165280.
The previous prime is 21202002187. The next prime is 21202002223. The reversal of 21202002211 is 11220020212.
It is a happy number.
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 21202002211 - 27 = 21202002083 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (13).
It is a junction number, because it is equal to n+sod(n) for n = 21202002191 and 21202002200.
It is not an unprimeable number, because it can be changed into a prime (21202002011) 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, 1740100 + ... + 1752241.
It is an arithmetic number, because the mean of its divisors is an integer number (2860228098).
Almost surely, 221202002211 is an apocalyptic number.
21202002211 is a deficient number, since it is larger than the sum of its proper divisors (1679822573).
21202002211 is a wasteful number, since it uses less digits than its factorization.
21202002211 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3492821.
The product of its (nonzero) digits is 32, while the sum is 13.
Adding to 21202002211 its reverse (11220020212), we get a palindrome (32422022423).
The spelling of 21202002211 in words is "twenty-one billion, two hundred two million, two thousand, two hundred eleven".