21555300359 has 2 divisors, whose sum is σ = 21555300360. Its totient is φ = 21555300358.

The previous prime is 21555300343. The next prime is 21555300449. The reversal of 21555300359 is 95300355512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21555300359 - 2⁴ = 21555300343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21555300859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10777650179 + 10777650180.

It is an arithmetic number, because the mean of its divisors is an integer number (10777650180).

Almost surely, 2^21555300359 is an apocalyptic number.

21555300359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21555300359 is an equidigital number, since it uses as much as digits as its factorization.

21555300359 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 101250, while the sum is 38.

The spelling of 21555300359 in words is "twenty-one billion, five hundred fifty-five million, three hundred thousand, three hundred fifty-nine".