21155361522259 has 2 divisors, whose sum is σ = 21155361522260. Its totient is φ = 21155361522258.

The previous prime is 21155361522247. The next prime is 21155361522277. The reversal of 21155361522259 is 95222516355112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21155361522259 - 2⁷ = 21155361522131 is a prime.

It is a super-2 number, since 2×21155361522259² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21155361562259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577680761129 + 10577680761130.

It is an arithmetic number, because the mean of its divisors is an integer number (10577680761130).

Almost surely, 2^{21155361522259} is an apocalyptic number.

21155361522259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21155361522259 is an equidigital number, since it uses as much as digits as its factorization.

21155361522259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620000, while the sum is 49.

The spelling of 21155361522259 in words is "twenty-one trillion, one hundred fifty-five billion, three hundred sixty-one million, five hundred twenty-two thousand, two hundred fifty-nine".