212916857 has 6 divisors (see below), whose sum is σ = 225505098. Its totient is φ = 200335712.

The previous prime is 212916853. The next prime is 212916877. The reversal of 212916857 is 758619212.

It can be written as a sum of positive squares in only one way, i.e., 200392336 + 12524521 = 14156^2 + 3539^2 .

It is not a de Polignac number, because 212916857 - 2² = 212916853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212916853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58394 + ... + 61932.

It is an arithmetic number, because the mean of its divisors is an integer number (37584183).

Almost surely, 2^212916857 is an apocalyptic number.

It is an amenable number.

212916857 is a deficient number, since it is larger than the sum of its proper divisors (12588241).

212916857 is an frugal number, since it uses more digits than its factorization.

212916857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7095 (or 3556 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 212916857 is about 14591.6708090609. The cubic root of 212916857 is about 597.1315464400.

The spelling of 212916857 in words is "two hundred twelve million, nine hundred sixteen thousand, eight hundred fifty-seven".