21216212432113 has 8 divisors (see below), whose sum is σ = 21947502769920. Its totient is φ = 20487853118640.

The previous prime is 21216212432083. The next prime is 21216212432131. The reversal of 21216212432113 is 31123421261212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21216212432113 - 2²⁵ = 21216178877681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (21216212412113) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 732741358 + ... + 732770311.

It is an arithmetic number, because the mean of its divisors is an integer number (2743437846240).

Almost surely, 2^{21216212432113} is an apocalyptic number.

It is an amenable number.

21216212432113 is a deficient number, since it is larger than the sum of its proper divisors (731290337807).

21216212432113 is a wasteful number, since it uses less digits than its factorization.

21216212432113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465512167.

The product of its digits is 6912, while the sum is 31.

Adding to 21216212432113 its reverse (31123421261212), we get a palindrome (52339633693325).

The spelling of 21216212432113 in words is "twenty-one trillion, two hundred sixteen billion, two hundred twelve million, four hundred thirty-two thousand, one hundred thirteen".