21000222210 has 64 divisors (see below), whose sum is σ = 55094805504. Its totient is φ = 5080555200.

The previous prime is 21000222101. The next prime is 21000222211. The reversal of 21000222210 is 1222200012.

It is not an unprimeable number, because it can be changed into a prime (21000222211) 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, 97227 + ... + 226833.

It is an arithmetic number, because the mean of its divisors is an integer number (860856336).

Almost surely, 2^21000222210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000222210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27547402752).

21000222210 is an abundant number, since it is smaller than the sum of its proper divisors (34094583294).

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

21000222210 is a wasteful number, since it uses less digits than its factorization.

21000222210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130119.

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

Adding to 21000222210 its reverse (1222200012), we get a palindrome (22222422222).

The spelling of 21000222210 in words is "twenty-one billion, two hundred twenty-two thousand, two hundred ten".