213012121 has 16 divisors (see below), whose sum is σ = 246280320. Its totient is φ = 180466560.

The previous prime is 213012109. The next prime is 213012133. The reversal of 213012121 is 121210312.

213012121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (213012109) and next prime (213012133).

It is a cyclic number.

It is not a de Polignac number, because 213012121 - 2⁹ = 213011609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213012101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372766 + ... + 373336.

It is an arithmetic number, because the mean of its divisors is an integer number (15392520).

Almost surely, 2^213012121 is an apocalyptic number.

It is an amenable number.

213012121 is a deficient number, since it is larger than the sum of its proper divisors (33268199).

213012121 is a wasteful number, since it uses less digits than its factorization.

213012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 213012121 is about 14594.9347720365. The cubic root of 213012121 is about 597.2205900517.

Adding to 213012121 its reverse (121210312), we get a palindrome (334222433).

The spelling of 213012121 in words is "two hundred thirteen million, twelve thousand, one hundred twenty-one".