21011120200000 has 168 divisors, whose sum is σ = 59558965732224. Its totient is φ = 7203812160000.

The previous prime is 21011120199997. The next prime is 21011120200069. The reversal of 21011120200000 is 202111012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21011120200000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6103972 + ... + 8903971.

It is an arithmetic number, because the mean of its divisors is an integer number (354517653168).

Almost surely, 2^{21011120200000} is an apocalyptic number.

21011120200000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011120200000 is an abundant number, since it is smaller than the sum of its proper divisors (38547845532224).

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

21011120200000 is an frugal number, since it uses more digits than its factorization.

21011120200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15007987 (or 15007957 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21011120200000 its reverse (202111012), we get a palindrome (21011322311012).

The spelling of 21011120200000 in words is "twenty-one trillion, eleven billion, one hundred twenty million, two hundred thousand".