21230332147 has 2 divisors, whose sum is σ = 21230332148. Its totient is φ = 21230332146.

The previous prime is 21230332141. The next prime is 21230332169. The reversal of 21230332147 is 74123303212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230332147 is a prime.

It is not a weakly prime, because it can be changed into another prime (21230332141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615166073 + 10615166074.

It is an arithmetic number, because the mean of its divisors is an integer number (10615166074).

Almost surely, 2^21230332147 is an apocalyptic number.

21230332147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230332147 is an equidigital number, since it uses as much as digits as its factorization.

21230332147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 28.

Adding to 21230332147 its reverse (74123303212), we get a palindrome (95353635359).

The spelling of 21230332147 in words is "twenty-one billion, two hundred thirty million, three hundred thirty-two thousand, one hundred forty-seven".