213238767639 has 4 divisors (see below), whose sum is σ = 284318356856. Its totient is φ = 142159178424.

The previous prime is 213238767629. The next prime is 213238767661. The reversal of 213238767639 is 936767832312.

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

It is a de Polignac number, because none of the positive numbers 2^k-213238767639 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 (213238767629) 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, 35539794604 + ... + 35539794609.

It is an arithmetic number, because the mean of its divisors is an integer number (71079589214).

Almost surely, 2^213238767639 is an apocalyptic number.

213238767639 is a deficient number, since it is larger than the sum of its proper divisors (71079589217).

213238767639 is an equidigital number, since it uses as much as digits as its factorization.

213238767639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71079589216.

The product of its digits is 13716864, while the sum is 57.

The spelling of 213238767639 in words is "two hundred thirteen billion, two hundred thirty-eight million, seven hundred sixty-seven thousand, six hundred thirty-nine".