21121101101200 has 60 divisors (see below), whose sum is σ = 51458141878848. Its totient is φ = 8329448310400.

The previous prime is 21121101101179. The next prime is 21121101101203. The reversal of 21121101101200 is 210110112112.

It is a happy number.

It is a super-2 number, since 2×21121101101200² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121101101203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371821972 + ... + 371878771.

Almost surely, 2^{21121101101200} is an apocalyptic number.

21121101101200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121101101200 is an abundant number, since it is smaller than the sum of its proper divisors (30337040777648).

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

21121101101200 is a wasteful number, since it uses less digits than its factorization.

21121101101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743700832 (or 743700821 counting only the distinct ones).

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

Adding to 21121101101200 its reverse (210110112112), we get a palindrome (21331211213312).

The spelling of 21121101101200 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, one hundred one thousand, two hundred".