213009931243 has 4 divisors (see below), whose sum is σ = 213306190560. Its totient is φ = 212713671928.

The previous prime is 213009931241. The next prime is 213009931273. The reversal of 213009931243 is 342139900312.

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 213009931243 - 2¹ = 213009931241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213009931241) 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, 148128580 + ... + 148130017.

It is an arithmetic number, because the mean of its divisors is an integer number (53326547640).

Almost surely, 2^213009931243 is an apocalyptic number.

213009931243 is a deficient number, since it is larger than the sum of its proper divisors (296259317).

213009931243 is an equidigital number, since it uses as much as digits as its factorization.

213009931243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296259316.

The product of its (nonzero) digits is 34992, while the sum is 37.

The spelling of 213009931243 in words is "two hundred thirteen billion, nine million, nine hundred thirty-one thousand, two hundred forty-three".