21036134633 has 2 divisors, whose sum is σ = 21036134634. Its totient is φ = 21036134632.

The previous prime is 21036134569. The next prime is 21036134641. The reversal of 21036134633 is 33643163012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20991083689 + 45050944 = 144883^2 + 6712^2 .

It is a cyclic number.

It is not a de Polignac number, because 21036134633 - 2⁶ = 21036134569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21036134633.

It is not a weakly prime, because it can be changed into another prime (21036133633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518067316 + 10518067317.

It is an arithmetic number, because the mean of its divisors is an integer number (10518067317).

Almost surely, 2^21036134633 is an apocalyptic number.

It is an amenable number.

21036134633 is a deficient number, since it is larger than the sum of its proper divisors (1).

21036134633 is an equidigital number, since it uses as much as digits as its factorization.

21036134633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 32.

Adding to 21036134633 its reverse (33643163012), we get a palindrome (54679297645).

The spelling of 21036134633 in words is "twenty-one billion, thirty-six million, one hundred thirty-four thousand, six hundred thirty-three".