213213431443 has 4 divisors (see below), whose sum is σ = 215169518080. Its totient is φ = 211257344808.

The previous prime is 213213431441. The next prime is 213213431447. The reversal of 213213431443 is 344134312312.

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 213213431443 - 2¹ = 213213431441 is a prime.

It is a super-2 number, since 2×213213431443² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213213431441) 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, 978043155 + ... + 978043372.

It is an arithmetic number, because the mean of its divisors is an integer number (53792379520).

Almost surely, 2^213213431443 is an apocalyptic number.

213213431443 is a deficient number, since it is larger than the sum of its proper divisors (1956086637).

213213431443 is a wasteful number, since it uses less digits than its factorization.

213213431443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956086636.

The product of its digits is 20736, while the sum is 31.

Adding to 213213431443 its reverse (344134312312), we get a palindrome (557347743755).

The spelling of 213213431443 in words is "two hundred thirteen billion, two hundred thirteen million, four hundred thirty-one thousand, four hundred forty-three".