21203459791019 has 8 divisors (see below), whose sum is σ = 23347225055808. Its totient is φ = 19095724194760.

The previous prime is 21203459791009. The next prime is 21203459791093. The reversal of 21203459791019 is 91019795430212.

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 21203459791019 - 2¹² = 21203459786923 is a prime.

It is a super-2 number, since 2×21203459791019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203459791009) 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, 9007415897 + ... + 9007418250.

It is an arithmetic number, because the mean of its divisors is an integer number (2918403131976).

Almost surely, 2^{21203459791019} is an apocalyptic number.

21203459791019 is a deficient number, since it is larger than the sum of its proper divisors (2143765264789).

21203459791019 is a wasteful number, since it uses less digits than its factorization.

21203459791019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18014834265.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The spelling of 21203459791019 in words is "twenty-one trillion, two hundred three billion, four hundred fifty-nine million, seven hundred ninety-one thousand, nineteen".