21220220000 has 120 divisors (see below), whose sum is σ = 59663164176. Its totient is φ = 7275456000.

The previous prime is 21220219973. The next prime is 21220220017. The reversal of 21220220000 is 2202212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64214 + ... + 215786.

Almost surely, 2^21220220000 is an apocalyptic number.

21220220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29831582088).

21220220000 is an abundant number, since it is smaller than the sum of its proper divisors (38442944176).

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

21220220000 is an equidigital number, since it uses as much as digits as its factorization.

21220220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151610 (or 151587 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 21220220000 its reverse (2202212), we get a palindrome (21222422212).

The spelling of 21220220000 in words is "twenty-one billion, two hundred twenty million, two hundred twenty thousand".