21554610630563 has 4 divisors (see below), whose sum is σ = 21562171001928. Its totient is φ = 21547050259200.

The previous prime is 21554610630559. The next prime is 21554610630617. The reversal of 21554610630563 is 36503601645512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21554610630563 - 2² = 21554610630559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21554610630503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3780181406 + ... + 3780187107.

It is an arithmetic number, because the mean of its divisors is an integer number (5390542750482).

Almost surely, 2^{21554610630563} is an apocalyptic number.

21554610630563 is a deficient number, since it is larger than the sum of its proper divisors (7560371365).

21554610630563 is an equidigital number, since it uses as much as digits as its factorization.

21554610630563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7560371364.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 21554610630563 in words is "twenty-one trillion, five hundred fifty-four billion, six hundred ten million, six hundred thirty thousand, five hundred sixty-three".