21103113131200 has 84 divisors (see below), whose sum is σ = 54659839813960. Its totient is φ = 7996969175040.

The previous prime is 21103113131189. The next prime is 21103113131207. The reversal of 21103113131200 is 213131130112.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21103113131207) 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, 347060277 + ... + 347121076.

Almost surely, 2^{21103113131200} is an apocalyptic number.

21103113131200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103113131200 is an abundant number, since it is smaller than the sum of its proper divisors (33556726682760).

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

21103113131200 is a wasteful number, since it uses less digits than its factorization.

21103113131200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694181394 (or 694181379 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 21103113131200 its reverse (213131130112), we get a palindrome (21316244261312).

The spelling of 21103113131200 in words is "twenty-one trillion, one hundred three billion, one hundred thirteen million, one hundred thirty-one thousand, two hundred".