21102110221200 has 120 divisors (see below), whose sum is σ = 67601236987968. Its totient is φ = 5626884426240.

The previous prime is 21102110221123. The next prime is 21102110221201. The reversal of 21102110221200 is 212201120112.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21102110221200.

It is not an unprimeable number, because it can be changed into a prime (21102110221201) 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, 19349674 + ... + 20411126.

Almost surely, 2^{21102110221200} is an apocalyptic number.

21102110221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102110221200 is an abundant number, since it is smaller than the sum of its proper divisors (46499126766768).

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

21102110221200 is a wasteful number, since it uses less digits than its factorization.

21102110221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078041 (or 1078030 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21102110221200 its reverse (212201120112), we get a palindrome (21314311341312).

The spelling of 21102110221200 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, two hundred twenty-one thousand, two hundred".