212400866 has 4 divisors (see below), whose sum is σ = 318601302. Its totient is φ = 106200432.

The previous prime is 212400823. The next prime is 212400889. The reversal of 212400866 is 668004212.

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., 165765625 + 46635241 = 12875^2 + 6829^2 .

It is a super-2 number, since 2×212400866² = 90228255755099912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53100215 + ... + 53100218.

Almost surely, 2^212400866 is an apocalyptic number.

212400866 is a deficient number, since it is larger than the sum of its proper divisors (106200436).

212400866 is a wasteful number, since it uses less digits than its factorization.

212400866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106200435.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 212400866 is about 14573.9790723055. The cubic root of 212400866 is about 596.6487856374.

The spelling of 212400866 in words is "two hundred twelve million, four hundred thousand, eight hundred sixty-six".