21220202010 has 256 divisors, whose sum is σ = 61421690880. Its totient is φ = 4591641600.

The previous prime is 21220201999. The next prime is 21220202039. The reversal of 21220202010 is 1020202212.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 48337371 + ... + 48337809.

It is an arithmetic number, because the mean of its divisors is an integer number (239928480).

Almost surely, 2^21220202010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220202010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30710845440).

21220202010 is an abundant number, since it is smaller than the sum of its proper divisors (40201488870).

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

21220202010 is a wasteful number, since it uses less digits than its factorization.

21220202010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653.

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

Adding to 21220202010 its reverse (1020202212), we get a palindrome (22240404222).

The spelling of 21220202010 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, ten".