213303531 has 16 divisors (see below), whose sum is σ = 331951104. Its totient is φ = 119293824.

The previous prime is 213303527. The next prime is 213303533. The reversal of 213303531 is 135303312.

It is not a de Polignac number, because 213303531 - 2² = 213303527 is a prime.

It is a super-2 number, since 2×213303531² = 90996792674135922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 213303498 and 213303507.

It is not an unprimeable number, because it can be changed into a prime (213303533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107070 + ... + 109043.

It is an arithmetic number, because the mean of its divisors is an integer number (20746944).

Almost surely, 2^213303531 is an apocalyptic number.

213303531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

213303531 is a deficient number, since it is larger than the sum of its proper divisors (118647573).

213303531 is a wasteful number, since it uses less digits than its factorization.

213303531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216170.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 213303531 is about 14604.9146180318. The cubic root of 213303531 is about 597.4928073456.

Adding to 213303531 its reverse (135303312), we get a palindrome (348606843).

The spelling of 213303531 in words is "two hundred thirteen million, three hundred three thousand, five hundred thirty-one".