21030131100 has 144 divisors (see below), whose sum is σ = 67504429440. Its totient is φ = 5011756800.

The previous prime is 21030131071. The next prime is 21030131113. The reversal of 21030131100 is 113103012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 140694 + ... + 248706.

It is an arithmetic number, because the mean of its divisors is an integer number (468780760).

Almost surely, 2^21030131100 is an apocalyptic number.

21030131100 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 21030131100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33752214720).

21030131100 is an abundant number, since it is smaller than the sum of its proper divisors (46474298340).

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

21030131100 is a wasteful number, since it uses less digits than its factorization.

21030131100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108100 (or 108093 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21030131100 its reverse (113103012), we get a palindrome (21143234112).

The spelling of 21030131100 in words is "twenty-one billion, thirty million, one hundred thirty-one thousand, one hundred".