19203244221421 has 8 divisors (see below), whose sum is σ = 20711145565880. Its totient is φ = 17699732692992.

The previous prime is 19203244221397. The next prime is 19203244221479. The reversal of 19203244221421 is 12412244230291.

It can be written as a sum of positive squares in 4 ways, for example, as 4302015256900 + 14901228964521 = 2074130^2 + 3860211^2 .

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 19203244221421 - 2²⁵ = 19203210666989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19203244221481) 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, 1097444916 + ... + 1097462413.

It is an arithmetic number, because the mean of its divisors is an integer number (2588893195735).

Almost surely, 2^{19203244221421} is an apocalyptic number.

It is an amenable number.

19203244221421 is a deficient number, since it is larger than the sum of its proper divisors (1507901344459).

19203244221421 is a wasteful number, since it uses less digits than its factorization.

19203244221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194908015.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 19203244221421 in words is "nineteen trillion, two hundred three billion, two hundred forty-four million, two hundred twenty-one thousand, four hundred twenty-one".