21612286247 has 2 divisors, whose sum is σ = 21612286248. Its totient is φ = 21612286246.

The previous prime is 21612286229. The next prime is 21612286273. The reversal of 21612286247 is 74268221612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21612286247 - 2⁶ = 21612286183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21612286207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806143123 + 10806143124.

It is an arithmetic number, because the mean of its divisors is an integer number (10806143124).

Almost surely, 2^21612286247 is an apocalyptic number.

21612286247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612286247 is an equidigital number, since it uses as much as digits as its factorization.

21612286247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 41.

The spelling of 21612286247 in words is "twenty-one billion, six hundred twelve million, two hundred eighty-six thousand, two hundred forty-seven".