213105021 has 8 divisors (see below), whose sum is σ = 293938080. Its totient is φ = 137170992.

The previous prime is 213104999. The next prime is 213105077. The reversal of 213105021 is 120501312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213105021 - 2¹⁰ = 213103997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213105521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1224655 + ... + 1224828.

It is an arithmetic number, because the mean of its divisors is an integer number (36742260).

Almost surely, 2^213105021 is an apocalyptic number.

It is an amenable number.

213105021 is a deficient number, since it is larger than the sum of its proper divisors (80833059).

213105021 is a wasteful number, since it uses less digits than its factorization.

213105021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2449515.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 213105021 is about 14598.1170361112. The cubic root of 213105021 is about 597.3073984594.

Adding to 213105021 its reverse (120501312), we get a palindrome (333606333).

The spelling of 213105021 in words is "two hundred thirteen million, one hundred five thousand, twenty-one".