21340240321233 has 4 divisors (see below), whose sum is σ = 28453653761648. Its totient is φ = 14226826880820.

The previous prime is 21340240321217. The next prime is 21340240321249. The reversal of 21340240321233 is 33212304204312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21340240321217) and next prime (21340240321249).

It is not a de Polignac number, because 21340240321233 - 2⁴ = 21340240321217 is a prime.

It is a super-3 number, since 3×21340240321233³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21340240321233.

It is not an unprimeable number, because it can be changed into a prime (21340240321633) 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, 3556706720203 + ... + 3556706720208.

It is an arithmetic number, because the mean of its divisors is an integer number (7113413440412).

Almost surely, 2^{21340240321233} is an apocalyptic number.

It is an amenable number.

21340240321233 is a deficient number, since it is larger than the sum of its proper divisors (7113413440415).

21340240321233 is an equidigital number, since it uses as much as digits as its factorization.

21340240321233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7113413440414.

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 21340240321233 its reverse (33212304204312), we get a palindrome (54552544525545).

The spelling of 21340240321233 in words is "twenty-one trillion, three hundred forty billion, two hundred forty million, three hundred twenty-one thousand, two hundred thirty-three".