21100443413212 has 48 divisors (see below), whose sum is σ = 37502676844864. Its totient is φ = 10385952192000.

The previous prime is 21100443413131. The next prime is 21100443413237. The reversal of 21100443413212 is 21231434400112.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 652420162 + ... + 652452502.

Almost surely, 2^{21100443413212} is an apocalyptic number.

It is an amenable number.

21100443413212 is a deficient number, since it is larger than the sum of its proper divisors (16402233431652).

21100443413212 is a wasteful number, since it uses less digits than its factorization.

21100443413212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36590 (or 36588 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21100443413212 its reverse (21231434400112), we get a palindrome (42331877813324).

The spelling of 21100443413212 in words is "twenty-one trillion, one hundred billion, four hundred forty-three million, four hundred thirteen thousand, two hundred twelve".