213405242241 has 4 divisors (see below), whose sum is σ = 284540322992. Its totient is φ = 142270161492.

The previous prime is 213405242221. The next prime is 213405242329. The reversal of 213405242241 is 142242504312.

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 not a de Polignac number, because 213405242241 - 2⁹ = 213405241729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213405242199 and 213405242208.

It is not an unprimeable number, because it can be changed into a prime (213405242221) 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, 35567540371 + ... + 35567540376.

It is an arithmetic number, because the mean of its divisors is an integer number (71135080748).

Almost surely, 2^213405242241 is an apocalyptic number.

It is an amenable number.

213405242241 is a deficient number, since it is larger than the sum of its proper divisors (71135080751).

213405242241 is an equidigital number, since it uses as much as digits as its factorization.

213405242241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71135080750.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 213405242241 its reverse (142242504312), we get a palindrome (355647746553).

The spelling of 213405242241 in words is "two hundred thirteen billion, four hundred five million, two hundred forty-two thousand, two hundred forty-one".