212509634399 has 4 divisors (see below), whose sum is σ = 212511297336. Its totient is φ = 212507971464.

The previous prime is 212509634377. The next prime is 212509634423. The reversal of 212509634399 is 993436905212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212509634399 - 2¹⁶ = 212509568863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212509634399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212509634339) 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, 622229 + ... + 901214.

It is an arithmetic number, because the mean of its divisors is an integer number (53127824334).

Almost surely, 2^212509634399 is an apocalyptic number.

212509634399 is a deficient number, since it is larger than the sum of its proper divisors (1662937).

212509634399 is a wasteful number, since it uses less digits than its factorization.

212509634399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662936.

The product of its (nonzero) digits is 3149280, while the sum is 53.

The spelling of 212509634399 in words is "two hundred twelve billion, five hundred nine million, six hundred thirty-four thousand, three hundred ninety-nine".