21011120200120 has 64 divisors (see below), whose sum is σ = 47297378580480. Its totient is φ = 8400474362496.

The previous prime is 21011120200117. The next prime is 21011120200141. The reversal of 21011120200120 is 2100202111012.

It is a self number, because there is not a number n which added to its sum of digits gives 21011120200120.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 891536577 + ... + 891560143.

It is an arithmetic number, because the mean of its divisors is an integer number (739021540320).

Almost surely, 2^{21011120200120} is an apocalyptic number.

21011120200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011120200120 is an abundant number, since it is smaller than the sum of its proper divisors (26286258380360).

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

21011120200120 is a wasteful number, since it uses less digits than its factorization.

21011120200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33172 (or 33168 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011120200120 its reverse (2100202111012), we get a palindrome (23111322311132).

The spelling of 21011120200120 in words is "twenty-one trillion, eleven billion, one hundred twenty million, two hundred thousand, one hundred twenty".