21043102434113 has 4 divisors (see below), whose sum is σ = 21043220264880. Its totient is φ = 21042984603348.

The previous prime is 21043102434089. The next prime is 21043102434119. The reversal of 21043102434113 is 31143420134012.

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 a cyclic number.

It is not a de Polignac number, because 21043102434113 - 2¹⁶ = 21043102368577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043102434119) 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, 58647095 + ... + 59004812.

It is an arithmetic number, because the mean of its divisors is an integer number (5260805066220).

Almost surely, 2^{21043102434113} is an apocalyptic number.

It is an amenable number.

21043102434113 is a deficient number, since it is larger than the sum of its proper divisors (117830767).

21043102434113 is a wasteful number, since it uses less digits than its factorization.

21043102434113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117830766.

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

Adding to 21043102434113 its reverse (31143420134012), we get a palindrome (52186522568125).

The spelling of 21043102434113 in words is "twenty-one trillion, forty-three billion, one hundred two million, four hundred thirty-four thousand, one hundred thirteen".