215021071 has 2 divisors, whose sum is σ = 215021072. Its totient is φ = 215021070.

The previous prime is 215021069. The next prime is 215021087. The reversal of 215021071 is 170120512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215021071 - 2¹ = 215021069 is a prime.

Together with 215021069, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215021011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107510535 + 107510536.

It is an arithmetic number, because the mean of its divisors is an integer number (107510536).

Almost surely, 2^215021071 is an apocalyptic number.

215021071 is a deficient number, since it is larger than the sum of its proper divisors (1).

215021071 is an equidigital number, since it uses as much as digits as its factorization.

215021071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 215021071 is about 14663.5967961479. The cubic root of 215021071 is about 599.0922114853.

Adding to 215021071 its reverse (170120512), we get a palindrome (385141583).

The spelling of 215021071 in words is "two hundred fifteen million, twenty-one thousand, seventy-one".