210135427 has 2 divisors, whose sum is σ = 210135428. Its totient is φ = 210135426.

The previous prime is 210135379. The next prime is 210135461. The reversal of 210135427 is 724531012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210135427 is a prime.

It is not a weakly prime, because it can be changed into another prime (210135467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105067713 + 105067714.

It is an arithmetic number, because the mean of its divisors is an integer number (105067714).

Almost surely, 2^210135427 is an apocalyptic number.

210135427 is a deficient number, since it is larger than the sum of its proper divisors (1).

210135427 is an equidigital number, since it uses as much as digits as its factorization.

210135427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 210135427 is about 14496.0486685165. The cubic root of 210135427 is about 594.5199404417.

Adding to 210135427 its reverse (724531012), we get a palindrome (934666439).

The spelling of 210135427 in words is "two hundred ten million, one hundred thirty-five thousand, four hundred twenty-seven".