21001122109153 has 2 divisors, whose sum is σ = 21001122109154. Its totient is φ = 21001122109152.

The previous prime is 21001122109103. The next prime is 21001122109157. The reversal of 21001122109153 is 35190122110012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13989604711824 + 7011517397329 = 3740268^2 + 2647927^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001122109153 - 2²¹ = 21001120012001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001122109157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500561054576 + 10500561054577.

It is an arithmetic number, because the mean of its divisors is an integer number (10500561054577).

Almost surely, 2^{21001122109153} is an apocalyptic number.

It is an amenable number.

21001122109153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001122109153 is an equidigital number, since it uses as much as digits as its factorization.

21001122109153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 28.

Adding to 21001122109153 its reverse (35190122110012), we get a palindrome (56191244219165).

The spelling of 21001122109153 in words is "twenty-one trillion, one billion, one hundred twenty-two million, one hundred nine thousand, one hundred fifty-three".