21155142253579 has 2 divisors, whose sum is σ = 21155142253580. Its totient is φ = 21155142253578.

The previous prime is 21155142253499. The next prime is 21155142253627. The reversal of 21155142253579 is 97535224155112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21155142253579 - 2⁷ = 21155142253451 is a prime.

It is not a weakly prime, because it can be changed into another prime (21155142253379) 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, 10577571126789 + 10577571126790.

It is an arithmetic number, because the mean of its divisors is an integer number (10577571126790).

Almost surely, 2^{21155142253579} is an apocalyptic number.

21155142253579 is a deficient number, since it is larger than the sum of its proper divisors (1).

21155142253579 is an equidigital number, since it uses as much as digits as its factorization.

21155142253579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780000, while the sum is 52.

The spelling of 21155142253579 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-two million, two hundred fifty-three thousand, five hundred seventy-nine".