21220022010 has 128 divisors (see below), whose sum is σ = 57704140800. Its totient is φ = 4949246720.

The previous prime is 21220021987. The next prime is 21220022023. The reversal of 21220022010 is 1022002212.

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, 903496 + ... + 926684.

It is an arithmetic number, because the mean of its divisors is an integer number (450813600).

Almost surely, 2^21220022010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220022010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28852070400).

21220022010 is an abundant number, since it is smaller than the sum of its proper divisors (36484118790).

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

21220022010 is a wasteful number, since it uses less digits than its factorization.

21220022010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23316.

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

Adding to 21220022010 its reverse (1022002212), we get a palindrome (22242024222).

The spelling of 21220022010 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, ten".