21321332147 has 2 divisors, whose sum is σ = 21321332148. Its totient is φ = 21321332146.

The previous prime is 21321332129. The next prime is 21321332159. The reversal of 21321332147 is 74123312312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321332147 - 2¹⁰ = 21321331123 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321332047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660666073 + 10660666074.

It is an arithmetic number, because the mean of its divisors is an integer number (10660666074).

Almost surely, 2^21321332147 is an apocalyptic number.

21321332147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321332147 is an equidigital number, since it uses as much as digits as its factorization.

21321332147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

Adding to 21321332147 its reverse (74123312312), we get a palindrome (95444644459).

The spelling of 21321332147 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirty-two thousand, one hundred forty-seven".