21111201101200 has 90 divisors (see below), whose sum is σ = 59000421622146. Its totient is φ = 7238126085120.

The previous prime is 21111201101173. The next prime is 21111201101231. The reversal of 21111201101200 is 210110211112.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 17793425664 + 21093407675536 = 133392^2 + 4592756^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 538531449 + ... + 538570648.

Almost surely, 2^{21111201101200} is an apocalyptic number.

21111201101200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111201101200 is an abundant number, since it is smaller than the sum of its proper divisors (37889220520946).

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

21111201101200 is a wasteful number, since it uses less digits than its factorization.

21111201101200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077102129 (or 1077102111 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111201101200 its reverse (210110211112), we get a palindrome (21321311312312).

The spelling of 21111201101200 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, one hundred one thousand, two hundred".