21304123151 has 2 divisors, whose sum is σ = 21304123152. Its totient is φ = 21304123150.

The previous prime is 21304123133. The next prime is 21304123157. The reversal of 21304123151 is 15132140312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21304123151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21304123157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652061575 + 10652061576.

It is an arithmetic number, because the mean of its divisors is an integer number (10652061576).

Almost surely, 2^21304123151 is an apocalyptic number.

21304123151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304123151 is an equidigital number, since it uses as much as digits as its factorization.

21304123151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21304123151 its reverse (15132140312), we get a palindrome (36436263463).

The spelling of 21304123151 in words is "twenty-one billion, three hundred four million, one hundred twenty-three thousand, one hundred fifty-one".