212217957 has 24 divisors (see below), whose sum is σ = 350839424. Its totient is φ = 121090464.

The previous prime is 212217917. The next prime is 212217979. The reversal of 212217957 is 759712212.

It is not a de Polignac number, because 212217957 - 2⁶ = 212217893 is a prime.

It is a super-2 number, since 2×212217957² = 90072922546507698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212217917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49803 + ... + 53895.

Almost surely, 2^212217957 is an apocalyptic number.

It is an amenable number.

212217957 is a deficient number, since it is larger than the sum of its proper divisors (138621467).

212217957 is a wasteful number, since it uses less digits than its factorization.

212217957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4929 (or 4926 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 212217957 is about 14567.7025299118. The cubic root of 212217957 is about 596.4774684229.

The spelling of 212217957 in words is "two hundred twelve million, two hundred seventeen thousand, nine hundred fifty-seven".