21523352100 has 36 divisors (see below), whose sum is σ = 62274232944. Its totient is φ = 5739560480.

The previous prime is 21523352089. The next prime is 21523352107. The reversal of 21523352100 is 125332512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21523352107) 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, 35871954 + ... + 35872553.

It is an arithmetic number, because the mean of its divisors is an integer number (1729839804).

Almost surely, 2^21523352100 is an apocalyptic number.

21523352100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21523352100 is an abundant number, since it is smaller than the sum of its proper divisors (40750880844).

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

21523352100 is a wasteful number, since it uses less digits than its factorization.

21523352100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71744524 (or 71744517 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21523352100 its reverse (125332512), we get a palindrome (21648684612).

The spelling of 21523352100 in words is "twenty-one billion, five hundred twenty-three million, three hundred fifty-two thousand, one hundred".