21000111100120 has 32 divisors (see below), whose sum is σ = 47305643076720. Its totient is φ = 8390196777600.

The previous prime is 21000111100109. The next prime is 21000111100127. The reversal of 21000111100120 is 2100111100012.

It is a super-4 number, since 4×21000111100120⁴ (a number of 54 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21000111100097 and 21000111100106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000111100127) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 307704906 + ... + 307773145.

Almost surely, 2^{21000111100120} is an apocalyptic number.

21000111100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000111100120 is an abundant number, since it is smaller than the sum of its proper divisors (26305531976600).

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

21000111100120 is a wasteful number, since it uses less digits than its factorization.

21000111100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615478915 (or 615478911 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21000111100120 its reverse (2100111100012), we get a palindrome (23100222200132).

The spelling of 21000111100120 in words is "twenty-one trillion, one hundred eleven million, one hundred thousand, one hundred twenty".