213360431223561 has 4 divisors (see below), whose sum is σ = 284480574964752. Its totient is φ = 142240287482372.

The previous prime is 213360431223559. The next prime is 213360431223601. The reversal of 213360431223561 is 165322134063312.

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 a cyclic number.

It is not a de Polignac number, because 213360431223561 - 2¹ = 213360431223559 is a prime.

It is a super-3 number, since 3×213360431223561³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (213360431223061) 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, 35560071870591 + ... + 35560071870596.

It is an arithmetic number, because the mean of its divisors is an integer number (71120143741188).

Almost surely, 2^{213360431223561} is an apocalyptic number.

It is an amenable number.

213360431223561 is a deficient number, since it is larger than the sum of its proper divisors (71120143741191).

213360431223561 is an equidigital number, since it uses as much as digits as its factorization.

213360431223561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71120143741190.

The product of its (nonzero) digits is 466560, while the sum is 42.

Adding to 213360431223561 its reverse (165322134063312), we get a palindrome (378682565286873).

The spelling of 213360431223561 in words is "two hundred thirteen trillion, three hundred sixty billion, four hundred thirty-one million, two hundred twenty-three thousand, five hundred sixty-one".