21354550421313 has 8 divisors (see below), whose sum is σ = 28477852151008. Its totient is φ = 14233807819584.

The previous prime is 21354550421257. The next prime is 21354550421327. The reversal of 21354550421313 is 31312405545312.

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

It is not a de Polignac number, because 21354550421313 - 2⁶ = 21354550421249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21354550421213) 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, 639762520 + ... + 639795897.

It is an arithmetic number, because the mean of its divisors is an integer number (3559731518876).

Almost surely, 2^{21354550421313} is an apocalyptic number.

It is an amenable number.

21354550421313 is a deficient number, since it is larger than the sum of its proper divisors (7123301729695).

21354550421313 is a wasteful number, since it uses less digits than its factorization.

21354550421313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279563983.

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 21354550421313 its reverse (31312405545312), we get a palindrome (52666955966625).

The spelling of 21354550421313 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred fifty million, four hundred twenty-one thousand, three hundred thirteen".