21100443413213 has 4 divisors (see below), whose sum is σ = 22210993066560. Its totient is φ = 19989893759868.

The previous prime is 21100443413131. The next prime is 21100443413237. The reversal of 21100443413213 is 31231434400112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21100443413213 - 2¹² = 21100443409117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100443413513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555274826645 + ... + 555274826682.

It is an arithmetic number, because the mean of its divisors is an integer number (5552748266640).

Almost surely, 2^{21100443413213} is an apocalyptic number.

It is an amenable number.

21100443413213 is a deficient number, since it is larger than the sum of its proper divisors (1110549653347).

21100443413213 is a wasteful number, since it uses less digits than its factorization.

21100443413213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110549653346.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 21100443413213 its reverse (31231434400112), we get a palindrome (52331877813325).

The spelling of 21100443413213 in words is "twenty-one trillion, one hundred billion, four hundred forty-three million, four hundred thirteen thousand, two hundred thirteen".