21815063219077 has 2 divisors, whose sum is σ = 21815063219078. Its totient is φ = 21815063219076.

The previous prime is 21815063219063. The next prime is 21815063219107. The reversal of 21815063219077 is 77091236051812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19489761507841 + 2325301711236 = 4414721^2 + 1524894^2 .

It is a cyclic number.

It is not a de Polignac number, because 21815063219077 - 2¹¹ = 21815063217029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21815063216077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907531609538 + 10907531609539.

It is an arithmetic number, because the mean of its divisors is an integer number (10907531609539).

Almost surely, 2^{21815063219077} is an apocalyptic number.

It is an amenable number.

21815063219077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21815063219077 is an equidigital number, since it uses as much as digits as its factorization.

21815063219077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 21815063219077 in words is "twenty-one trillion, eight hundred fifteen billion, sixty-three million, two hundred nineteen thousand, seventy-seven".