21002241100 has 72 divisors (see below), whose sum is σ = 46670450400. Its totient is φ = 8200558080.

The previous prime is 21002241083. The next prime is 21002241107. The reversal of 21002241100 is 114220012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21002241107) 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, 1044744 + ... + 1064656.

It is an arithmetic number, because the mean of its divisors is an integer number (648200700).

Almost surely, 2^21002241100 is an apocalyptic number.

21002241100 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 21002241100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23335225200).

21002241100 is an abundant number, since it is smaller than the sum of its proper divisors (25668209300).

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

21002241100 is a wasteful number, since it uses less digits than its factorization.

21002241100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20179 (or 20172 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002241100 its reverse (114220012), we get a palindrome (21116461112).

The spelling of 21002241100 in words is "twenty-one billion, two million, two hundred forty-one thousand, one hundred".