345186357221 has 4 divisors (see below), whose sum is σ = 345419435244. Its totient is φ = 344953279200.

The previous prime is 345186357193. The next prime is 345186357227. The reversal of 345186357221 is 122753681543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122753681543 = 1151 ⋅106649593.

It can be written as a sum of positive squares in 2 ways, for example, as 106480826596 + 238705530625 = 326314^2 + 488575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345186357221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345186357227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116536790 + ... + 116539751.

It is an arithmetic number, because the mean of its divisors is an integer number (86354858811).

Almost surely, 2^345186357221 is an apocalyptic number.

It is an amenable number.

345186357221 is a deficient number, since it is larger than the sum of its proper divisors (233078023).

345186357221 is a wasteful number, since it uses less digits than its factorization.

345186357221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233078022.

The product of its digits is 1209600, while the sum is 47.

The spelling of 345186357221 in words is "three hundred forty-five billion, one hundred eighty-six million, three hundred fifty-seven thousand, two hundred twenty-one".