215275121 has 2 divisors, whose sum is σ = 215275122. Its totient is φ = 215275120.

The previous prime is 215275117. The next prime is 215275127. The reversal of 215275121 is 121572512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109411600 + 105863521 = 10460^2 + 10289^2 .

It is a cyclic number.

It is not a de Polignac number, because 215275121 - 2² = 215275117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (215275127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107637560 + 107637561.

It is an arithmetic number, because the mean of its divisors is an integer number (107637561).

Almost surely, 2^215275121 is an apocalyptic number.

It is an amenable number.

215275121 is a deficient number, since it is larger than the sum of its proper divisors (1).

215275121 is an equidigital number, since it uses as much as digits as its factorization.

215275121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1400, while the sum is 26.

The square root of 215275121 is about 14672.2568475337. The cubic root of 215275121 is about 599.3280635239.

The spelling of 215275121 in words is "two hundred fifteen million, two hundred seventy-five thousand, one hundred twenty-one".