21111321131300 has 36 divisors (see below), whose sum is σ = 45981870136020. Its totient is φ = 8413136142720.

The previous prime is 21111321131297. The next prime is 21111321131311. The reversal of 21111321131300 is 313112311112.

It can be written as a sum of positive squares in 6 ways, for example, as 6001059486436 + 15110261644864 = 2449706^2 + 3887192^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 392376839 + ... + 392430638.

It is an arithmetic number, because the mean of its divisors is an integer number (1277274170445).

Almost surely, 2^{21111321131300} is an apocalyptic number.

21111321131300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111321131300 is an abundant number, since it is smaller than the sum of its proper divisors (24870549004720).

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

21111321131300 is a wasteful number, since it uses less digits than its factorization.

21111321131300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784807760 (or 784807753 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 21111321131300 its reverse (313112311112), we get a palindrome (21424433442412).

The spelling of 21111321131300 in words is "twenty-one trillion, one hundred eleven billion, three hundred twenty-one million, one hundred thirty-one thousand, three hundred".