21121001110100 has 36 divisors (see below), whose sum is σ = 45834930764700. Its totient is φ = 8447965724160.

The previous prime is 21121001110081. The next prime is 21121001110123. The reversal of 21121001110100 is 101110012112.

It can be written as a sum of positive squares in 6 ways, for example, as 6372605457604 + 14748395652496 = 2524402^2 + 3840364^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3477365 + ... + 7371164.

Almost surely, 2^{21121001110100} is an apocalyptic number.

21121001110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121001110100 is an abundant number, since it is smaller than the sum of its proper divisors (24713929654600).

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

21121001110100 is a wasteful number, since it uses less digits than its factorization.

21121001110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10868012 (or 10868005 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21121001110100 its reverse (101110012112), we get a palindrome (21222111122212).

The spelling of 21121001110100 in words is "twenty-one trillion, one hundred twenty-one billion, one million, one hundred ten thousand, one hundred".