21345320443438 has 8 divisors (see below), whose sum is σ = 32542865594280. Its totient is φ = 10497698578680.

The previous prime is 21345320443373. The next prime is 21345320443439. The reversal of 21345320443438 is 83434402354312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345320443439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87480821368 + ... + 87480821611.

It is an arithmetic number, because the mean of its divisors is an integer number (4067858199285).

Almost surely, 2^{21345320443438} is an apocalyptic number.

21345320443438 is a deficient number, since it is larger than the sum of its proper divisors (11197545150842).

21345320443438 is a wasteful number, since it uses less digits than its factorization.

21345320443438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174961643042.

The product of its (nonzero) digits is 3317760, while the sum is 46.

The spelling of 21345320443438 in words is "twenty-one trillion, three hundred forty-five billion, three hundred twenty million, four hundred forty-three thousand, four hundred thirty-eight".