21020022210 has 128 divisors (see below), whose sum is σ = 55502496000. Its totient is φ = 5052625920.

The previous prime is 21020022209. The next prime is 21020022241. The reversal of 21020022210 is 1222002012.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26373532 + ... + 26374328.

It is an arithmetic number, because the mean of its divisors is an integer number (433613250).

Almost surely, 2^21020022210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020022210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27751248000).

21020022210 is an abundant number, since it is smaller than the sum of its proper divisors (34482473790).

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

21020022210 is a wasteful number, since it uses less digits than its factorization.

21020022210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396.

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

Adding to 21020022210 its reverse (1222002012), we get a palindrome (22242024222).

The spelling of 21020022210 in words is "twenty-one billion, twenty million, twenty-two thousand, two hundred ten".