213147688521 has 4 divisors (see below), whose sum is σ = 284196918032. Its totient is φ = 142098459012.

The previous prime is 213147688519. The next prime is 213147688549. The reversal of 213147688521 is 125886741312.

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 not a de Polignac number, because 213147688521 - 2¹ = 213147688519 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213147688511) 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, 35524614751 + ... + 35524614756.

It is an arithmetic number, because the mean of its divisors is an integer number (71049229508).

Almost surely, 2^213147688521 is an apocalyptic number.

It is an amenable number.

213147688521 is a deficient number, since it is larger than the sum of its proper divisors (71049229511).

213147688521 is an equidigital number, since it uses as much as digits as its factorization.

213147688521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71049229510.

The product of its digits is 645120, while the sum is 48.

The spelling of 213147688521 in words is "two hundred thirteen billion, one hundred forty-seven million, six hundred eighty-eight thousand, five hundred twenty-one".