21201020022210 has 64 divisors (see below), whose sum is σ = 58307271213312. Its totient is φ = 4832955599616.

The previous prime is 21201020022199. The next prime is 21201020022211. The reversal of 21201020022210 is 1222002010212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21201020022210.

It is not an unprimeable number, because it can be changed into a prime (21201020022211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135253089 + ... + 135409748.

It is an arithmetic number, because the mean of its divisors is an integer number (911051112708).

Almost surely, 2^{21201020022210} is an apocalyptic number.

21201020022210 is an abundant number, since it is smaller than the sum of its proper divisors (37106251191102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201020022210 is a wasteful number, since it uses less digits than its factorization.

21201020022210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270663227.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21201020022210 its reverse (1222002010212), we get a palindrome (22423022032422).

The spelling of 21201020022210 in words is "twenty-one trillion, two hundred one billion, twenty million, twenty-two thousand, two hundred ten".