21120002121200 has 60 divisors (see below), whose sum is σ = 50743255393440. Its totient is φ = 8447592890880.

The previous prime is 21120002121199. The next prime is 21120002121203. The reversal of 21120002121200 is 212120002112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120002121203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7087172 + ... + 9616028.

It is an arithmetic number, because the mean of its divisors is an integer number (845720923224).

Almost surely, 2^{21120002121200} is an apocalyptic number.

21120002121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120002121200 is an abundant number, since it is smaller than the sum of its proper divisors (29623253272240).

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

21120002121200 is a wasteful number, since it uses less digits than its factorization.

21120002121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549754 (or 2549743 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21120002121200 its reverse (212120002112), we get a palindrome (21332122123312).

The spelling of 21120002121200 in words is "twenty-one trillion, one hundred twenty billion, two million, one hundred twenty-one thousand, two hundred".