21111001109153 has 2 divisors, whose sum is σ = 21111001109154. Its totient is φ = 21111001109152.

The previous prime is 21111001109141. The next prime is 21111001109171. The reversal of 21111001109153 is 35190110011112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20698969350544 + 412031758609 = 4549612^2 + 641897^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111001109153 - 2⁴ = 21111001109137 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111001109113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555500554576 + 10555500554577.

It is an arithmetic number, because the mean of its divisors is an integer number (10555500554577).

Almost surely, 2^{21111001109153} is an apocalyptic number.

It is an amenable number.

21111001109153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111001109153 is an equidigital number, since it uses as much as digits as its factorization.

21111001109153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 26.

The spelling of 21111001109153 in words is "twenty-one trillion, one hundred eleven billion, one million, one hundred nine thousand, one hundred fifty-three".