21554610630601 has 4 divisors (see below), whose sum is σ = 21556888417792. Its totient is φ = 21552332843412.

The previous prime is 21554610630559. The next prime is 21554610630617. The reversal of 21554610630601 is 10603601645512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21554610630601 - 2⁹ = 21554610630089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21554610630401) 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, 1138879401 + ... + 1138898326.

It is an arithmetic number, because the mean of its divisors is an integer number (5389222104448).

Almost surely, 2^{21554610630601} is an apocalyptic number.

It is an amenable number.

21554610630601 is a deficient number, since it is larger than the sum of its proper divisors (2277787191).

21554610630601 is an equidigital number, since it uses as much as digits as its factorization.

21554610630601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277787190.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 21554610630601 in words is "twenty-one trillion, five hundred fifty-four billion, six hundred ten million, six hundred thirty thousand, six hundred one".