212257216 has 14 divisors (see below), whose sum is σ = 421198040. Its totient is φ = 106128576.

The previous prime is 212257169. The next prime is 212257219. The reversal of 212257216 is 612752212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212257219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1658196 + ... + 1658323.

Almost surely, 2^212257216 is an apocalyptic number.

It is an amenable number.

212257216 is a deficient number, since it is larger than the sum of its proper divisors (208940824).

212257216 is an equidigital number, since it uses as much as digits as its factorization.

212257216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316531 (or 3316521 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 212257216 is about 14569.0499347075. The cubic root of 212257216 is about 596.5142476936.

It can be divided in two parts, 21225 and 7216, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 212257216 in words is "two hundred twelve million, two hundred fifty-seven thousand, two hundred sixteen".