21030311203100 has 144 divisors (see below), whose sum is σ = 46433520876960. Its totient is φ = 8266511769600.

The previous prime is 21030311203093. The next prime is 21030311203117. The reversal of 21030311203100 is 130211303012.

It is a super-3 number, since 3×21030311203100³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 1214142440 + ... + 1214159760.

It is an arithmetic number, because the mean of its divisors is an integer number (322455006090).

Almost surely, 2^{21030311203100} is an apocalyptic number.

21030311203100 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 21030311203100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23216760438480).

21030311203100 is an abundant number, since it is smaller than the sum of its proper divisors (25403209673860).

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

21030311203100 is a wasteful number, since it uses less digits than its factorization.

21030311203100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18360 (or 18353 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21030311203100 its reverse (130211303012), we get a palindrome (21160522506112).

The spelling of 21030311203100 in words is "twenty-one trillion, thirty billion, three hundred eleven million, two hundred three thousand, one hundred".