21152555343211 has 2 divisors, whose sum is σ = 21152555343212. Its totient is φ = 21152555343210.

The previous prime is 21152555343173. The next prime is 21152555343251. The reversal of 21152555343211 is 11234355525112.

It is an a-pointer prime, because the next prime (21152555343251) can be obtained adding 21152555343211 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21152555343211 - 2¹⁵ = 21152555310443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21152555343251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576277671605 + 10576277671606.

It is an arithmetic number, because the mean of its divisors is an integer number (10576277671606).

Almost surely, 2^{21152555343211} is an apocalyptic number.

21152555343211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152555343211 is an equidigital number, since it uses as much as digits as its factorization.

21152555343211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180000, while the sum is 40.

The spelling of 21152555343211 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifty-five million, three hundred forty-three thousand, two hundred eleven".