21554610630559 has 2 divisors, whose sum is σ = 21554610630560. Its totient is φ = 21554610630558.

The previous prime is 21554610630523. The next prime is 21554610630617. The reversal of 21554610630559 is 95503601645512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21554610630559 - 2¹⁵ = 21554610597791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21554610630359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10777305315279 + 10777305315280.

It is an arithmetic number, because the mean of its divisors is an integer number (10777305315280).

Almost surely, 2^{21554610630559} is an apocalyptic number.

21554610630559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21554610630559 is an equidigital number, since it uses as much as digits as its factorization.

21554610630559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 21554610630559 in words is "twenty-one trillion, five hundred fifty-four billion, six hundred ten million, six hundred thirty thousand, five hundred fifty-nine".