213231427 has 2 divisors, whose sum is σ = 213231428. Its totient is φ = 213231426.

The previous prime is 213231397. The next prime is 213231443. The reversal of 213231427 is 724132312.

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-213231427 is a prime.

It is not a weakly prime, because it can be changed into another prime (213231457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106615713 + 106615714.

It is an arithmetic number, because the mean of its divisors is an integer number (106615714).

Almost surely, 2^213231427 is an apocalyptic number.

213231427 is a deficient number, since it is larger than the sum of its proper divisors (1).

213231427 is an equidigital number, since it uses as much as digits as its factorization.

213231427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 213231427 is about 14602.4459252551. The cubic root of 213231427 is about 597.4254753196.

Adding to 213231427 its reverse (724132312), we get a palindrome (937363739).

The spelling of 213231427 in words is "two hundred thirteen million, two hundred thirty-one thousand, four hundred twenty-seven".