21827305551605 has 8 divisors (see below), whose sum is σ = 26561678868864. Its totient is φ = 17215902970000.

The previous prime is 21827305551587. The next prime is 21827305551637. The reversal of 21827305551605 is 50615550372812.

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

It is a de Polignac number, because none of the positive numbers 2^k-21827305551605 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30742683521 + ... + 30742684230.

It is an arithmetic number, because the mean of its divisors is an integer number (3320209858608).

Almost surely, 2^{21827305551605} is an apocalyptic number.

It is an amenable number.

21827305551605 is a deficient number, since it is larger than the sum of its proper divisors (4734373317259).

21827305551605 is an equidigital number, since it uses as much as digits as its factorization.

21827305551605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61485367827.

The product of its (nonzero) digits is 2520000, while the sum is 50.

The spelling of 21827305551605 in words is "twenty-one trillion, eight hundred twenty-seven billion, three hundred five million, five hundred fifty-one thousand, six hundred five".