21203233113247 has 2 divisors, whose sum is σ = 21203233113248. Its totient is φ = 21203233113246.

The previous prime is 21203233113173. The next prime is 21203233113269. The reversal of 21203233113247 is 74231133230212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203233113247 - 2¹⁵ = 21203233080479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203234113247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601616556623 + 10601616556624.

It is an arithmetic number, because the mean of its divisors is an integer number (10601616556624).

Almost surely, 2^{21203233113247} is an apocalyptic number.

21203233113247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203233113247 is an equidigital number, since it uses as much as digits as its factorization.

21203233113247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 34.

Adding to 21203233113247 its reverse (74231133230212), we get a palindrome (95434366343459).

The spelling of 21203233113247 in words is "twenty-one trillion, two hundred three billion, two hundred thirty-three million, one hundred thirteen thousand, two hundred forty-seven".