21010421153 has 2 divisors, whose sum is σ = 21010421154. Its totient is φ = 21010421152.

The previous prime is 21010421143. The next prime is 21010421183. The reversal of 21010421153 is 35112401012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20065289104 + 945132049 = 141652^2 + 30743^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010421153 - 2²⁸ = 20741985697 is a prime.

It is not a weakly prime, because it can be changed into another prime (21010421143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505210576 + 10505210577.

It is an arithmetic number, because the mean of its divisors is an integer number (10505210577).

Almost surely, 2^21010421153 is an apocalyptic number.

It is an amenable number.

21010421153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010421153 is an equidigital number, since it uses as much as digits as its factorization.

21010421153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21010421153 its reverse (35112401012), we get a palindrome (56122822165).

The spelling of 21010421153 in words is "twenty-one billion, ten million, four hundred twenty-one thousand, one hundred fifty-three".