21152225121211 has 2 divisors, whose sum is σ = 21152225121212. Its totient is φ = 21152225121210.

The previous prime is 21152225121173. The next prime is 21152225121257. The reversal of 21152225121211 is 11212152225112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21152225121211 is a prime.

It is a super-3 number, since 3×21152225121211³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21152225121211.

It is not a weakly prime, because it can be changed into another prime (21152225125211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576112560605 + 10576112560606.

It is an arithmetic number, because the mean of its divisors is an integer number (10576112560606).

Almost surely, 2^{21152225121211} is an apocalyptic number.

21152225121211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152225121211 is an equidigital number, since it uses as much as digits as its factorization.

21152225121211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 28.

Adding to 21152225121211 its reverse (11212152225112), we get a palindrome (32364377346323).

The spelling of 21152225121211 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred twenty-five million, one hundred twenty-one thousand, two hundred eleven".