21355466424157 has 2 divisors, whose sum is σ = 21355466424158. Its totient is φ = 21355466424156.

The previous prime is 21355466424139. The next prime is 21355466424179. The reversal of 21355466424157 is 75142466455312.

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., 21191788730116 + 163677694041 = 4603454^2 + 404571^2 .

It is a cyclic number.

It is not a de Polignac number, because 21355466424157 - 2¹¹ = 21355466422109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21355466424098 and 21355466424107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21355466424137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677733212078 + 10677733212079.

It is an arithmetic number, because the mean of its divisors is an integer number (10677733212079).

Almost surely, 2^{21355466424157} is an apocalyptic number.

It is an amenable number.

21355466424157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355466424157 is an equidigital number, since it uses as much as digits as its factorization.

21355466424157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192000, while the sum is 55.

The spelling of 21355466424157 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred sixty-six million, four hundred twenty-four thousand, one hundred fifty-seven".