21442330100 has 72 divisors (see below), whose sum is σ = 47176147200. Its totient is φ = 8458070400.

The previous prime is 21442330067. The next prime is 21442330103. The reversal of 21442330100 is 103324412.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442330103) 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, 12315230 + ... + 12316970.

Almost surely, 2^21442330100 is an apocalyptic number.

21442330100 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 21442330100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23588073600).

21442330100 is an abundant number, since it is smaller than the sum of its proper divisors (25733817100).

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

21442330100 is a wasteful number, since it uses less digits than its factorization.

21442330100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3393 (or 3386 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21442330100 its reverse (103324412), we get a palindrome (21545654512).

The spelling of 21442330100 in words is "twenty-one billion, four hundred forty-two million, three hundred thirty thousand, one hundred".