213401643 has 32 divisors (see below), whose sum is σ = 356160000. Its totient is φ = 110647296.

The previous prime is 213401641. The next prime is 213401651. The reversal of 213401643 is 346104312.

It is not a de Polignac number, because 213401643 - 2¹ = 213401641 is a prime.

It is a super-4 number, since 4×213401643⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (213401641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9483 + ... + 22731.

It is an arithmetic number, because the mean of its divisors is an integer number (11130000).

Almost surely, 2^213401643 is an apocalyptic number.

213401643 is a deficient number, since it is larger than the sum of its proper divisors (142758357).

213401643 is a wasteful number, since it uses less digits than its factorization.

213401643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13331.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 213401643 is about 14608.2731012259. The cubic root of 213401643 is about 597.5844017486.

Adding to 213401643 its reverse (346104312), we get a palindrome (559505955).

It can be divided in two parts, 213 and 401643, that added together give a triangular number (401856 = T₈₉₆).

The spelling of 213401643 in words is "two hundred thirteen million, four hundred one thousand, six hundred forty-three".