21554601827 has 8 divisors (see below), whose sum is σ = 23522887920. Its totient is φ = 19587778560.

The previous prime is 21554601791. The next prime is 21554601829. The reversal of 21554601827 is 72810645512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21554601827 - 2⁸ = 21554601571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21554601829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334778 + ... + 393935.

It is an arithmetic number, because the mean of its divisors is an integer number (2940360990).

Almost surely, 2^21554601827 is an apocalyptic number.

21554601827 is a deficient number, since it is larger than the sum of its proper divisors (1968286093).

21554601827 is a wasteful number, since it uses less digits than its factorization.

21554601827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731413.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 21554601827 in words is "twenty-one billion, five hundred fifty-four million, six hundred one thousand, eight hundred twenty-seven".