212004431 has 4 divisors (see below), whose sum is σ = 212332752. Its totient is φ = 211676112.

The previous prime is 212004427. The next prime is 212004437. The reversal of 212004431 is 134400212.

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 212004431 - 2² = 212004427 is a prime.

It is a super-2 number, since 2×212004431² = 89891757527267522, 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 (212004437) 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, 163190 + ... + 164483.

It is an arithmetic number, because the mean of its divisors is an integer number (53083188).

Almost surely, 2^212004431 is an apocalyptic number.

212004431 is a deficient number, since it is larger than the sum of its proper divisors (328321).

212004431 is an equidigital number, since it uses as much as digits as its factorization.

212004431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328320.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212004431 is about 14560.3719389307. The cubic root of 212004431 is about 596.2773499695.

Adding to 212004431 its reverse (134400212), we get a palindrome (346404643).

The spelling of 212004431 in words is "two hundred twelve million, four thousand, four hundred thirty-one".