21284503519423 has 16 divisors (see below), whose sum is σ = 21868331581440. Its totient is φ = 20706190967776.

The previous prime is 21284503519387. The next prime is 21284503519439. The reversal of 21284503519423 is 32491530548212.

It is a cyclic number.

It is not a de Polignac number, because 21284503519423 - 2³³ = 21275913584831 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 (21284503514423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33337986 + ... + 33970432.

It is an arithmetic number, because the mean of its divisors is an integer number (1366770723840).

Almost surely, 2^{21284503519423} is an apocalyptic number.

21284503519423 is a deficient number, since it is larger than the sum of its proper divisors (583828062017).

21284503519423 is a wasteful number, since it uses less digits than its factorization.

21284503519423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636806.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 21284503519423 in words is "twenty-one trillion, two hundred eighty-four billion, five hundred three million, five hundred nineteen thousand, four hundred twenty-three".