21100121134208 has 32 divisors (see below), whose sum is σ = 42057793041660. Its totient is φ = 10544439743488.

The previous prime is 21100121134177. The next prime is 21100121134243. The reversal of 21100121134208 is 80243112100112.

It can be written as a sum of positive squares in 2 ways, for example, as 19337408194624 + 1762712939584 = 4397432^2 + 1327672^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21100121134208² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43671491 + ... + 44152002.

Almost surely, 2^{21100121134208} is an apocalyptic number.

It is an amenable number.

21100121134208 is a deficient number, since it is larger than the sum of its proper divisors (20957671907452).

21100121134208 is an equidigital number, since it uses as much as digits as its factorization.

21100121134208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87825384 (or 87825372 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The spelling of 21100121134208 in words is "twenty-one trillion, one hundred billion, one hundred twenty-one million, one hundred thirty-four thousand, two hundred eight".