212018431 has 4 divisors (see below), whose sum is σ = 212059512. Its totient is φ = 211977352.

The previous prime is 212018419. The next prime is 212018483. The reversal of 212018431 is 134810212.

It is a happy number.

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 212018431 - 2¹⁵ = 211985663 is a prime.

It is a super-2 number, since 2×212018431² = 89903630167403522, 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 (212018231) 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, 11461 + ... + 23566.

It is an arithmetic number, because the mean of its divisors is an integer number (53014878).

Almost surely, 2^212018431 is an apocalyptic number.

212018431 is a deficient number, since it is larger than the sum of its proper divisors (41081).

212018431 is an equidigital number, since it uses as much as digits as its factorization.

212018431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41080.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 212018431 is about 14560.8526879438. The cubic root of 212018431 is about 596.2904750083.

Adding to 212018431 its reverse (134810212), we get a palindrome (346828643).

The spelling of 212018431 in words is "two hundred twelve million, eighteen thousand, four hundred thirty-one".