213730066 has 16 divisors (see below), whose sum is σ = 351973440. Its totient is φ = 96529680.

The previous prime is 213730061. The next prime is 213730133. The reversal of 213730066 is 660037312.

It is a super-2 number, since 2×213730066² = 91361082224728712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213730061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27486 + ... + 34393.

It is an arithmetic number, because the mean of its divisors is an integer number (21998340).

Almost surely, 2^213730066 is an apocalyptic number.

213730066 is a deficient number, since it is larger than the sum of its proper divisors (138243374).

213730066 is a wasteful number, since it uses less digits than its factorization.

213730066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62049.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 213730066 is about 14619.5097729028. The cubic root of 213730066 is about 597.8908034305.

Adding to 213730066 its reverse (660037312), we get a palindrome (873767378).

It can be divided in two parts, 21 and 3730066, that multiplied together give a triangular number (78331386 = T₁₂₅₁₆).

The spelling of 213730066 in words is "two hundred thirteen million, seven hundred thirty thousand, sixty-six".