21533541152957 has 2 divisors, whose sum is σ = 21533541152958. Its totient is φ = 21533541152956.

The previous prime is 21533541152927. The next prime is 21533541153083. The reversal of 21533541152957 is 75925114533512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20016729688036 + 1516811464921 = 4474006^2 + 1231589^2 .

It is a cyclic number.

It is not a de Polignac number, because 21533541152957 - 2¹⁰ = 21533541151933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21533541152899 and 21533541152908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21533541152927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10766770576478 + 10766770576479.

It is an arithmetic number, because the mean of its divisors is an integer number (10766770576479).

Almost surely, 2^{21533541152957} is an apocalyptic number.

It is an amenable number.

21533541152957 is a deficient number, since it is larger than the sum of its proper divisors (1).

21533541152957 is an equidigital number, since it uses as much as digits as its factorization.

21533541152957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670000, while the sum is 53.

The spelling of 21533541152957 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred forty-one million, one hundred fifty-two thousand, nine hundred fifty-seven".