212380557509 has 4 divisors (see below), whose sum is σ = 221614494816. Its totient is φ = 203146620204.

The previous prime is 212380557457. The next prime is 212380557517. The reversal of 212380557509 is 905755083212.

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 de Polignac number, because none of the positive numbers 2^k-212380557509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212380557409) 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, 4616968619 + ... + 4616968664.

It is an arithmetic number, because the mean of its divisors is an integer number (55403623704).

Almost surely, 2^212380557509 is an apocalyptic number.

It is an amenable number.

212380557509 is a deficient number, since it is larger than the sum of its proper divisors (9233937307).

212380557509 is an equidigital number, since it uses as much as digits as its factorization.

212380557509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9233937306.

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 212380557509 in words is "two hundred twelve billion, three hundred eighty million, five hundred fifty-seven thousand, five hundred nine".