21510216119827 has 2 divisors, whose sum is σ = 21510216119828. Its totient is φ = 21510216119826.

The previous prime is 21510216119759. The next prime is 21510216119839. The reversal of 21510216119827 is 72891161201512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21510216119827 is a prime.

It is not a weakly prime, because it can be changed into another prime (21510216119857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10755108059913 + 10755108059914.

It is an arithmetic number, because the mean of its divisors is an integer number (10755108059914).

Almost surely, 2^{21510216119827} is an apocalyptic number.

21510216119827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21510216119827 is an equidigital number, since it uses as much as digits as its factorization.

21510216119827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 46.

The spelling of 21510216119827 in words is "twenty-one trillion, five hundred ten billion, two hundred sixteen million, one hundred nineteen thousand, eight hundred twenty-seven".