21150023523653 has 2 divisors, whose sum is σ = 21150023523654. Its totient is φ = 21150023523652.

The previous prime is 21150023523589. The next prime is 21150023523679. The reversal of 21150023523653 is 35632532005112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21149264961889 + 758561764 = 4598833^2 + 27542^2 .

It is a cyclic number.

It is not a de Polignac number, because 21150023523653 - 2⁶ = 21150023523589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21150023523683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575011761826 + 10575011761827.

It is an arithmetic number, because the mean of its divisors is an integer number (10575011761827).

Almost surely, 2^{21150023523653} is an apocalyptic number.

It is an amenable number.

21150023523653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150023523653 is an equidigital number, since it uses as much as digits as its factorization.

21150023523653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 38.

Adding to 21150023523653 its reverse (35632532005112), we get a palindrome (56782555528765).

The spelling of 21150023523653 in words is "twenty-one trillion, one hundred fifty billion, twenty-three million, five hundred twenty-three thousand, six hundred fifty-three".