215021087 has 2 divisors, whose sum is σ = 215021088. Its totient is φ = 215021086.

The previous prime is 215021071. The next prime is 215021111. The reversal of 215021087 is 780120512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215021087 - 2⁴ = 215021071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215020087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107510543 + 107510544.

It is an arithmetic number, because the mean of its divisors is an integer number (107510544).

Almost surely, 2^215021087 is an apocalyptic number.

215021087 is a deficient number, since it is larger than the sum of its proper divisors (1).

215021087 is an equidigital number, since it uses as much as digits as its factorization.

215021087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 215021087 is about 14663.5973417167. The cubic root of 215021087 is about 599.0922263450.

Adding to 215021087 its reverse (780120512), we get a palindrome (995141599).

The spelling of 215021087 in words is "two hundred fifteen million, twenty-one thousand, eighty-seven".