212431066 has 4 divisors (see below), whose sum is σ = 318646602. Its totient is φ = 106215532.

The previous prime is 212431057. The next prime is 212431069. The reversal of 212431066 is 660134212.

212431066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 212430625 + 441 = 14575^2 + 21^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212431066.

It is not an unprimeable number, because it can be changed into a prime (212431069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53107765 + ... + 53107768.

Almost surely, 2^212431066 is an apocalyptic number.

212431066 is a deficient number, since it is larger than the sum of its proper divisors (106215536).

212431066 is a wasteful number, since it uses less digits than its factorization.

212431066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106215535.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 212431066 is about 14575.0151286371. The cubic root of 212431066 is about 596.6770622632.

Adding to 212431066 its reverse (660134212), we get a palindrome (872565278).

The spelling of 212431066 in words is "two hundred twelve million, four hundred thirty-one thousand, sixty-six".