21240310333013 has 8 divisors (see below), whose sum is σ = 22914075077208. Its totient is φ = 19613693891584.

The previous prime is 21240310332929. The next prime is 21240310333019. The reversal of 21240310333013 is 31033301304212.

It can be written as a sum of positive squares in 4 ways, for example, as 13567892305444 + 7672418027569 = 3683462^2 + 2769913^2 .

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 21240310333013 - 2²⁶ = 21240243224149 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 (21240310333019) 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, 11787074756 + ... + 11787076557.

It is an arithmetic number, because the mean of its divisors is an integer number (2864259384651).

Almost surely, 2^{21240310333013} is an apocalyptic number.

It is an amenable number.

21240310333013 is a deficient number, since it is larger than the sum of its proper divisors (1673764744195).

21240310333013 is a wasteful number, since it uses less digits than its factorization.

21240310333013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23574151383.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21240310333013 its reverse (31033301304212), we get a palindrome (52273611637225).

The spelling of 21240310333013 in words is "twenty-one trillion, two hundred forty billion, three hundred ten million, three hundred thirty-three thousand, thirteen".