21404550057747 has 8 divisors (see below), whose sum is σ = 28563443384256. Its totient is φ = 14257678384872.

The previous prime is 21404550057679. The next prime is 21404550057769. The reversal of 21404550057747 is 74775005540412.

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

It is not a de Polignac number, because 21404550057747 - 2⁷ = 21404550057619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21404550057747.

It is not an unprimeable number, because it can be changed into a prime (21404550007747) 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, 3005409253 + ... + 3005416374.

It is an arithmetic number, because the mean of its divisors is an integer number (3570430423032).

Almost surely, 2^{21404550057747} is an apocalyptic number.

21404550057747 is a deficient number, since it is larger than the sum of its proper divisors (7158893326509).

21404550057747 is a wasteful number, since it uses less digits than its factorization.

21404550057747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6010826817.

The product of its (nonzero) digits is 5488000, while the sum is 51.

The spelling of 21404550057747 in words is "twenty-one trillion, four hundred four billion, five hundred fifty million, fifty-seven thousand, seven hundred forty-seven".