345213217821 has 8 divisors (see below), whose sum is σ = 471510736704. Its totient is φ = 224528922080.

The previous prime is 345213217763. The next prime is 345213217849. The reversal of 345213217821 is 128712312543.

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 345213217821 - 2⁶ = 345213217757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 345213217821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345213217861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1403305641 + ... + 1403305886.

It is an arithmetic number, because the mean of its divisors is an integer number (58938842088).

Almost surely, 2^345213217821 is an apocalyptic number.

It is an amenable number.

345213217821 is a deficient number, since it is larger than the sum of its proper divisors (126297518883).

345213217821 is a wasteful number, since it uses less digits than its factorization.

345213217821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806611571.

The product of its digits is 80640, while the sum is 39.

The spelling of 345213217821 in words is "three hundred forty-five billion, two hundred thirteen million, two hundred seventeen thousand, eight hundred twenty-one".