213221087 has 2 divisors, whose sum is σ = 213221088. Its totient is φ = 213221086.

The previous prime is 213221053. The next prime is 213221117. The reversal of 213221087 is 780122312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213221087 - 2¹⁴ = 213204703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213221387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106610543 + 106610544.

It is an arithmetic number, because the mean of its divisors is an integer number (106610544).

Almost surely, 2^213221087 is an apocalyptic number.

213221087 is a deficient number, since it is larger than the sum of its proper divisors (1).

213221087 is an equidigital number, since it uses as much as digits as its factorization.

213221087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 213221087 is about 14602.0918706876. The cubic root of 213221087 is about 597.4158183953.

Adding to 213221087 its reverse (780122312), we get a palindrome (993343399).

The spelling of 213221087 in words is "two hundred thirteen million, two hundred twenty-one thousand, eighty-seven".