213105512 has 8 divisors (see below), whose sum is σ = 399572850. Its totient is φ = 106552752.

The previous prime is 213105499. The next prime is 213105517. The reversal of 213105512 is 215501312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 124858276 + 88247236 = 11174^2 + 9394^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (213105517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13319087 + ... + 13319102.

Almost surely, 2^213105512 is an apocalyptic number.

It is an amenable number.

213105512 is a deficient number, since it is larger than the sum of its proper divisors (186467338).

213105512 is a wasteful number, since it uses less digits than its factorization.

213105512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26638195 (or 26638191 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 213105512 is about 14598.1338533389. The cubic root of 213105512 is about 597.3078571968.

Adding to 213105512 its reverse (215501312), we get a palindrome (428606824).

The spelling of 213105512 in words is "two hundred thirteen million, one hundred five thousand, five hundred twelve".