21031032110100 has 144 divisors (see below), whose sum is σ = 62166333266688. Its totient is φ = 5487018485760.

The previous prime is 21031032110089. The next prime is 21031032110141. The reversal of 21031032110100 is 101123013012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21031032110100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40022664 + ... + 40544736.

Almost surely, 2^{21031032110100} is an apocalyptic number.

21031032110100 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 21031032110100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31083166633344).

21031032110100 is an abundant number, since it is smaller than the sum of its proper divisors (41135301156588).

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

21031032110100 is a wasteful number, since it uses less digits than its factorization.

21031032110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524994 (or 524987 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21031032110100 its reverse (101123013012), we get a palindrome (21132155123112).

The spelling of 21031032110100 in words is "twenty-one trillion, thirty-one billion, thirty-two million, one hundred ten thousand, one hundred".