213110021 has 8 divisors (see below), whose sum is σ = 219204480. Its totient is φ = 207067392.

The previous prime is 213109993. The next prime is 213110033. The reversal of 213110021 is 120011312.

213110021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 213110021 - 2⁶ = 213109957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213109984 and 213110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213110041) 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, 4541 + ... + 21138.

It is an arithmetic number, because the mean of its divisors is an integer number (27400560).

Almost surely, 2^213110021 is an apocalyptic number.

It is an amenable number.

213110021 is a deficient number, since it is larger than the sum of its proper divisors (6094459).

213110021 is a wasteful number, since it uses less digits than its factorization.

213110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25915.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 213110021 is about 14598.2882900702. The cubic root of 213110021 is about 597.3120698864.

Adding to 213110021 its reverse (120011312), we get a palindrome (333121333).

The spelling of 213110021 in words is "two hundred thirteen million, one hundred ten thousand, twenty-one".