21015110153 has 2 divisors, whose sum is σ = 21015110154. Its totient is φ = 21015110152.

The previous prime is 21015110117. The next prime is 21015110213. The reversal of 21015110153 is 35101151012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10813504144 + 10201606009 = 103988^2 + 101003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21015110153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21015110353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10507555076 + 10507555077.

It is an arithmetic number, because the mean of its divisors is an integer number (10507555077).

Almost surely, 2^21015110153 is an apocalyptic number.

It is an amenable number.

21015110153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21015110153 is an equidigital number, since it uses as much as digits as its factorization.

21015110153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 20.

Adding to 21015110153 its reverse (35101151012), we get a palindrome (56116261165).

The spelling of 21015110153 in words is "twenty-one billion, fifteen million, one hundred ten thousand, one hundred fifty-three".