211230431 has 4 divisors (see below), whose sum is σ = 214383192. Its totient is φ = 208077672.

The previous prime is 211230407. The next prime is 211230433. The reversal of 211230431 is 134032112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211230431 is a prime.

It is a super-2 number, since 2×211230431² = 89236589960891522, 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 (211230433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1576280 + ... + 1576413.

It is an arithmetic number, because the mean of its divisors is an integer number (53595798).

Almost surely, 2^211230431 is an apocalyptic number.

211230431 is a deficient number, since it is larger than the sum of its proper divisors (3152761).

211230431 is an equidigital number, since it uses as much as digits as its factorization.

211230431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152760.

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

The square root of 211230431 is about 14533.7686440923. The cubic root of 211230431 is about 595.5508219808.

Adding to 211230431 its reverse (134032112), we get a palindrome (345262543).

The spelling of 211230431 in words is "two hundred eleven million, two hundred thirty thousand, four hundred thirty-one".