21021121011200 has 60 divisors (see below), whose sum is σ = 52081469612040. Its totient is φ = 8408448399360.

The previous prime is 21021121011157. The next prime is 21021121011217. The reversal of 21021121011200 is 211012112012.

It is a super-3 number, since 3×21021121011200³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 821124740 + ... + 821150339.

It is an arithmetic number, because the mean of its divisors is an integer number (868024493534).

Almost surely, 2^{21021121011200} is an apocalyptic number.

21021121011200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021121011200 is an abundant number, since it is smaller than the sum of its proper divisors (31060348600840).

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

21021121011200 is an equidigital number, since it uses as much as digits as its factorization.

21021121011200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642275107 (or 1642275086 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21021121011200 its reverse (211012112012), we get a palindrome (21232133123212).

The spelling of 21021121011200 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-one million, eleven thousand, two hundred".