213211507 has 2 divisors, whose sum is σ = 213211508. Its totient is φ = 213211506.

The previous prime is 213211489. The next prime is 213211511. The reversal of 213211507 is 705112312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213211507 is a prime.

It is a super-2 number, since 2×213211507² = 90918293434422098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213211577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106605753 + 106605754.

It is an arithmetic number, because the mean of its divisors is an integer number (106605754).

Almost surely, 2^213211507 is an apocalyptic number.

213211507 is a deficient number, since it is larger than the sum of its proper divisors (1).

213211507 is an equidigital number, since it uses as much as digits as its factorization.

213211507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 213211507 is about 14601.7638318116. The cubic root of 213211507 is about 597.4068709856.

Adding to 213211507 its reverse (705112312), we get a palindrome (918323819).

The spelling of 213211507 in words is "two hundred thirteen million, two hundred eleven thousand, five hundred seven".