21251304527 has 2 divisors, whose sum is σ = 21251304528. Its totient is φ = 21251304526.

The previous prime is 21251304521. The next prime is 21251304551. The reversal of 21251304527 is 72540315212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21251304527 - 2¹⁰ = 21251303503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21251304493 and 21251304502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21251304521) 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, 10625652263 + 10625652264.

It is an arithmetic number, because the mean of its divisors is an integer number (10625652264).

Almost surely, 2^21251304527 is an apocalyptic number.

21251304527 is a deficient number, since it is larger than the sum of its proper divisors (1).

21251304527 is an equidigital number, since it uses as much as digits as its factorization.

21251304527 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 32.

Adding to 21251304527 its reverse (72540315212), we get a palindrome (93791619739).

The spelling of 21251304527 in words is "twenty-one billion, two hundred fifty-one million, three hundred four thousand, five hundred twenty-seven".