21304421330251 has 2 divisors, whose sum is σ = 21304421330252. Its totient is φ = 21304421330250.

The previous prime is 21304421330221. The next prime is 21304421330317. The reversal of 21304421330251 is 15203312440312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21304421330251 - 2⁹ = 21304421329739 is a prime.

It is not a weakly prime, because it can be changed into another prime (21304421330221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652210665125 + 10652210665126.

It is an arithmetic number, because the mean of its divisors is an integer number (10652210665126).

Almost surely, 2^{21304421330251} is an apocalyptic number.

21304421330251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304421330251 is an equidigital number, since it uses as much as digits as its factorization.

21304421330251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21304421330251 its reverse (15203312440312), we get a palindrome (36507733770563).

The spelling of 21304421330251 in words is "twenty-one trillion, three hundred four billion, four hundred twenty-one million, three hundred thirty thousand, two hundred fifty-one".