21220300100 has 72 divisors (see below), whose sum is σ = 48597931200. Its totient is φ = 8020425600.

The previous prime is 21220300067. The next prime is 21220300103. The reversal of 21220300100 is 100302212.

It is a happy number.

It is a super-2 number, since 2×21220300100² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220300103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 724745 + ... + 753455.

Almost surely, 2^21220300100 is an apocalyptic number.

21220300100 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 21220300100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24298965600).

21220300100 is an abundant number, since it is smaller than the sum of its proper divisors (27377631100).

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

21220300100 is a wasteful number, since it uses less digits than its factorization.

21220300100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29133 (or 29126 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21220300100 its reverse (100302212), we get a palindrome (21320602312).

The spelling of 21220300100 in words is "twenty-one billion, two hundred twenty million, three hundred thousand, one hundred".