212219668 has 6 divisors (see below), whose sum is σ = 371384426. Its totient is φ = 106109832.

The previous prime is 212219647. The next prime is 212219669. The reversal of 212219668 is 866912212.

It can be written as a sum of positive squares in only one way, i.e., 197458704 + 14760964 = 14052^2 + 3842^2 .

It is a super-3 number, since 3×212219668³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212219669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26527455 + ... + 26527462.

Almost surely, 2^212219668 is an apocalyptic number.

It is an amenable number.

212219668 is a deficient number, since it is larger than the sum of its proper divisors (159164758).

212219668 is a wasteful number, since it uses less digits than its factorization.

212219668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53054921 (or 53054919 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 212219668 is about 14567.7612555945. The cubic root of 212219668 is about 596.4790714449.

The spelling of 212219668 in words is "two hundred twelve million, two hundred nineteen thousand, six hundred sixty-eight".