21011320001100 has 288 divisors, whose sum is σ = 73883648643840. Its totient is φ = 4539701376000.

The previous prime is 21011320001093. The next prime is 21011320001117. The reversal of 21011320001100 is 110002311012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7200286 + ... + 9688485.

It is an arithmetic number, because the mean of its divisors is an integer number (256540446680).

Almost surely, 2^{21011320001100} is an apocalyptic number.

21011320001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011320001100 is an abundant number, since it is smaller than the sum of its proper divisors (52872328642740).

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

21011320001100 is a wasteful number, since it uses less digits than its factorization.

21011320001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16888841 (or 16888834 counting only the distinct ones).

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

Adding to 21011320001100 its reverse (110002311012), we get a palindrome (21121322312112).

The spelling of 21011320001100 in words is "twenty-one trillion, eleven billion, three hundred twenty million, one thousand, one hundred".