21143493523 has 8 divisors (see below), whose sum is σ = 21505982400. Its totient is φ = 20781142248.

The previous prime is 21143493499. The next prime is 21143493541. The reversal of 21143493523 is 32539434112.

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 21143493523 - 2²⁹ = 20606622611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21143493593) 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, 303768 + ... + 366826.

It is an arithmetic number, because the mean of its divisors is an integer number (2688247800).

Almost surely, 2^21143493523 is an apocalyptic number.

21143493523 is a deficient number, since it is larger than the sum of its proper divisors (362488877).

21143493523 is an equidigital number, since it uses as much as digits as its factorization.

21143493523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68801.

The product of its digits is 77760, while the sum is 37.

The spelling of 21143493523 in words is "twenty-one billion, one hundred forty-three million, four hundred ninety-three thousand, five hundred twenty-three".