21231130100 has 36 divisors (see below), whose sum is σ = 48496375200. Its totient is φ = 8045480160.

The previous prime is 21231130061. The next prime is 21231130103. The reversal of 21231130100 is 103113212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231130103) 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, 5585240 + ... + 5589039.

Almost surely, 2^21231130100 is an apocalyptic number.

21231130100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231130100 is an abundant number, since it is smaller than the sum of its proper divisors (27265245100).

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

21231130100 is a wasteful number, since it uses less digits than its factorization.

21231130100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11174312 (or 11174305 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21231130100 its reverse (103113212), we get a palindrome (21334243312).

The spelling of 21231130100 in words is "twenty-one billion, two hundred thirty-one million, one hundred thirty thousand, one hundred".