213179686721 has 4 divisors (see below), whose sum is σ = 213184651200. Its totient is φ = 213174722244.

The previous prime is 213179686679. The next prime is 213179686739. The reversal of 213179686721 is 127686971312.

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 cyclic number.

It is not a de Polignac number, because 213179686721 - 2²² = 213175492417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213179686751) 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, 2417261 + ... + 2503898.

It is an arithmetic number, because the mean of its divisors is an integer number (53296162800).

Almost surely, 2^213179686721 is an apocalyptic number.

It is an amenable number.

213179686721 is a deficient number, since it is larger than the sum of its proper divisors (4964479).

213179686721 is an equidigital number, since it uses as much as digits as its factorization.

213179686721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4964478.

The product of its digits is 1524096, while the sum is 53.

The spelling of 213179686721 in words is "two hundred thirteen billion, one hundred seventy-nine million, six hundred eighty-six thousand, seven hundred twenty-one".