21121022012200 has 96 divisors (see below), whose sum is σ = 53572763088000. Its totient is φ = 7680060403200.

The previous prime is 21121022012183. The next prime is 21121022012203. The reversal of 21121022012200 is 221022012112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21121022012203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58072516 + ... + 58435084.

It is an arithmetic number, because the mean of its divisors is an integer number (558049615500).

Almost surely, 2^{21121022012200} is an apocalyptic number.

21121022012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121022012200 is an abundant number, since it is smaller than the sum of its proper divisors (32451741075800).

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

21121022012200 is a wasteful number, since it uses less digits than its factorization.

21121022012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389075 (or 389066 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21121022012200 its reverse (221022012112), we get a palindrome (21342044024312).

The spelling of 21121022012200 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-two million, twelve thousand, two hundred".