213102431 has 4 divisors (see below), whose sum is σ = 213353112. Its totient is φ = 212851752.

The previous prime is 213102427. The next prime is 213102433. The reversal of 213102431 is 134201312.

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 213102431 - 2² = 213102427 is a prime.

It is a super-2 number, since 2×213102431² = 90825292196219522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213102433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124061 + ... + 125766.

It is an arithmetic number, because the mean of its divisors is an integer number (53338278).

Almost surely, 2^213102431 is an apocalyptic number.

213102431 is a deficient number, since it is larger than the sum of its proper divisors (250681).

213102431 is an equidigital number, since it uses as much as digits as its factorization.

213102431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250680.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 213102431 is about 14598.0283257706. The cubic root of 213102431 is about 597.3049786315.

Adding to 213102431 its reverse (134201312), we get a palindrome (347303743).

The spelling of 213102431 in words is "two hundred thirteen million, one hundred two thousand, four hundred thirty-one".