21612514234247 has 8 divisors (see below), whose sum is σ = 22203601104816. Its totient is φ = 21021793935552.

The previous prime is 21612514234193. The next prime is 21612514234261. The reversal of 21612514234247 is 74243241521612.

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 21612514234247 - 2¹⁴ = 21612514217863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21612514234198 and 21612514234207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612514234277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91523438 + ... + 91759275.

It is an arithmetic number, because the mean of its divisors is an integer number (2775450138102).

Almost surely, 2^{21612514234247} is an apocalyptic number.

21612514234247 is a deficient number, since it is larger than the sum of its proper divisors (591086870569).

21612514234247 is a wasteful number, since it uses less digits than its factorization.

21612514234247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183285937.

The product of its digits is 645120, while the sum is 44.

Adding to 21612514234247 its reverse (74243241521612), we get a palindrome (95855755755859).

The spelling of 21612514234247 in words is "twenty-one trillion, six hundred twelve billion, five hundred fourteen million, two hundred thirty-four thousand, two hundred forty-seven".