213538427 has 4 divisors (see below), whose sum is σ = 214002096. Its totient is φ = 213074760.

The previous prime is 213538349. The next prime is 213538441. The reversal of 213538427 is 724835312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213538427 - 2¹⁶ = 213472891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213538477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231143 + ... + 232064.

It is an arithmetic number, because the mean of its divisors is an integer number (53500524).

Almost surely, 2^213538427 is an apocalyptic number.

213538427 is a deficient number, since it is larger than the sum of its proper divisors (463669).

213538427 is an equidigital number, since it uses as much as digits as its factorization.

213538427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463668.

The product of its digits is 40320, while the sum is 35.

The square root of 213538427 is about 14612.9540819097. The cubic root of 213538427 is about 597.7120523227.

It can be divided in two parts, 2135 and 38427, that multiplied together give a triangular number (82041645 = T₁₂₈₀₉).

The spelling of 213538427 in words is "two hundred thirteen million, five hundred thirty-eight thousand, four hundred twenty-seven".