21243001333403 has 4 divisors (see below), whose sum is σ = 21243011658288. Its totient is φ = 21242991008520.

The previous prime is 21243001333259. The next prime is 21243001333423. The reversal of 21243001333403 is 30433310034212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21243001333403 - 2¹⁴ = 21243001317019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21243001333423) 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, 906983 + ... + 6580928.

It is an arithmetic number, because the mean of its divisors is an integer number (5310752914572).

Almost surely, 2^{21243001333403} is an apocalyptic number.

21243001333403 is a deficient number, since it is larger than the sum of its proper divisors (10324885).

21243001333403 is an equidigital number, since it uses as much as digits as its factorization.

21243001333403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10324884.

The product of its (nonzero) digits is 15552, while the sum is 29.

Adding to 21243001333403 its reverse (30433310034212), we get a palindrome (51676311367615).

The spelling of 21243001333403 in words is "twenty-one trillion, two hundred forty-three billion, one million, three hundred thirty-three thousand, four hundred three".