21355466727549 has 8 divisors (see below), whose sum is σ = 28474176402432. Its totient is φ = 14236867435520.

The previous prime is 21355466727461. The next prime is 21355466727563. The reversal of 21355466727549 is 94572766455312.

It is a happy number.

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 21355466727549 - 2⁸ = 21355466727293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21355466727549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355466727149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27143229 + ... + 27918914.

It is an arithmetic number, because the mean of its divisors is an integer number (3559272050304).

Almost surely, 2^{21355466727549} is an apocalyptic number.

It is an amenable number.

21355466727549 is a deficient number, since it is larger than the sum of its proper divisors (7118709674883).

21355466727549 is a wasteful number, since it uses less digits than its factorization.

21355466727549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55191427.

The product of its digits is 381024000, while the sum is 66.

The spelling of 21355466727549 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred sixty-six million, seven hundred twenty-seven thousand, five hundred forty-nine".