213520643 has 16 divisors (see below), whose sum is σ = 248371200. Its totient is φ = 179776800.

The previous prime is 213520639. The next prime is 213520667. The reversal of 213520643 is 346025312.

It is not a de Polignac number, because 213520643 - 2² = 213520639 is a prime.

It is a super-3 number, since 3×213520643³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (213520943) 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 15 ways as a sum of consecutive naturals, for example, 172838 + ... + 174068.

It is an arithmetic number, because the mean of its divisors is an integer number (15523200).

Almost surely, 2^213520643 is an apocalyptic number.

213520643 is a deficient number, since it is larger than the sum of its proper divisors (34850557).

213520643 is a wasteful number, since it uses less digits than its factorization.

213520643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 213520643 is about 14612.3455680462. The cubic root of 213520643 is about 597.6954588905.

Adding to 213520643 its reverse (346025312), we get a palindrome (559545955).

The spelling of 213520643 in words is "two hundred thirteen million, five hundred twenty thousand, six hundred forty-three".