21106612150913 has 2 divisors, whose sum is σ = 21106612150914. Its totient is φ = 21106612150912.

The previous prime is 21106612150907. The next prime is 21106612151143. The reversal of 21106612150913 is 31905121660112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19494494376049 + 1612117774864 = 4415257^2 + 1269692^2 .

It is a cyclic number.

It is not a de Polignac number, because 21106612150913 - 2¹⁴ = 21106612134529 is a prime.

It is not a weakly prime, because it can be changed into another prime (21106612150513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553306075456 + 10553306075457.

It is an arithmetic number, because the mean of its divisors is an integer number (10553306075457).

Almost surely, 2^{21106612150913} is an apocalyptic number.

It is an amenable number.

21106612150913 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106612150913 is an equidigital number, since it uses as much as digits as its factorization.

21106612150913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 21106612150913 in words is "twenty-one trillion, one hundred six billion, six hundred twelve million, one hundred fifty thousand, nine hundred thirteen".