21374326165503 has 4 divisors (see below), whose sum is σ = 28499101554008. Its totient is φ = 14249550777000.

The previous prime is 21374326165469. The next prime is 21374326165529. The reversal of 21374326165503 is 30556162347312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21374326165503 - 2²² = 21374321971199 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 (21374326165553) 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, 3562387694248 + ... + 3562387694253.

It is an arithmetic number, because the mean of its divisors is an integer number (7124775388502).

Almost surely, 2^{21374326165503} is an apocalyptic number.

21374326165503 is a deficient number, since it is larger than the sum of its proper divisors (7124775388505).

21374326165503 is an equidigital number, since it uses as much as digits as its factorization.

21374326165503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124775388504.

The product of its (nonzero) digits is 2721600, while the sum is 48.

The spelling of 21374326165503 in words is "twenty-one trillion, three hundred seventy-four billion, three hundred twenty-six million, one hundred sixty-five thousand, five hundred three".