21200022210 has 128 divisors (see below), whose sum is σ = 54980239104. Its totient is φ = 5212569600.

The previous prime is 21200022197. The next prime is 21200022211. The reversal of 21200022210 is 1222000212.

It is not an unprimeable number, because it can be changed into a prime (21200022211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4994349 + ... + 4998591.

It is an arithmetic number, because the mean of its divisors is an integer number (429533118).

Almost surely, 2^21200022210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200022210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27490119552).

21200022210 is an abundant number, since it is smaller than the sum of its proper divisors (33780216894).

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

21200022210 is a wasteful number, since it uses less digits than its factorization.

21200022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21200022210 its reverse (1222000212), we get a palindrome (22422022422).

It can be divided in two parts, 2120002 and 2210, that added together give a palindrome (2122212).

The spelling of 21200022210 in words is "twenty-one billion, two hundred million, twenty-two thousand, two hundred ten".