21304242100 has 36 divisors (see below), whose sum is σ = 48663378400. Its totient is φ = 8073185760.

The previous prime is 21304242079. The next prime is 21304242103. The reversal of 21304242100 is 124240312.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304242103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5604480 + ... + 5608279.

Almost surely, 2^21304242100 is an apocalyptic number.

21304242100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21304242100 is an abundant number, since it is smaller than the sum of its proper divisors (27359136300).

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

21304242100 is a wasteful number, since it uses less digits than its factorization.

21304242100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11212792 (or 11212785 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21304242100 its reverse (124240312), we get a palindrome (21428482412).

The spelling of 21304242100 in words is "twenty-one billion, three hundred four million, two hundred forty-two thousand, one hundred".