213667121 has 2 divisors, whose sum is σ = 213667122. Its totient is φ = 213667120.

The previous prime is 213667093. The next prime is 213667127. The reversal of 213667121 is 121766312.

213667121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202350625 + 11316496 = 14225^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 213667121 - 2⁶ = 213667057 is a prime.

It is not a weakly prime, because it can be changed into another prime (213667127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106833560 + 106833561.

It is an arithmetic number, because the mean of its divisors is an integer number (106833561).

Almost surely, 2^213667121 is an apocalyptic number.

It is an amenable number.

213667121 is a deficient number, since it is larger than the sum of its proper divisors (1).

213667121 is an equidigital number, since it uses as much as digits as its factorization.

213667121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 213667121 is about 14617.3568404141. The cubic root of 213667121 is about 597.8321033258.

The spelling of 213667121 in words is "two hundred thirteen million, six hundred sixty-seven thousand, one hundred twenty-one".