21450544051405 has 8 divisors (see below), whose sum is σ = 29417888984832. Its totient is φ = 14708944492368.

The previous prime is 21450544051333. The next prime is 21450544051429. The reversal of 21450544051405 is 50415044505412.

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

It is not a de Polignac number, because 21450544051405 - 2³³ = 21441954116813 is a prime.

It is a Duffinian 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, 306436343557 + ... + 306436343626.

It is an arithmetic number, because the mean of its divisors is an integer number (3677236123104).

Almost surely, 2^{21450544051405} is an apocalyptic number.

It is an amenable number.

21450544051405 is a deficient number, since it is larger than the sum of its proper divisors (7967344933427).

21450544051405 is an equidigital number, since it uses as much as digits as its factorization.

21450544051405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612872687195.

The product of its (nonzero) digits is 320000, while the sum is 40.

Adding to 21450544051405 its reverse (50415044505412), we get a palindrome (71865588556817).

The spelling of 21450544051405 in words is "twenty-one trillion, four hundred fifty billion, five hundred forty-four million, fifty-one thousand, four hundred five".