212220917 has 8 divisors (see below), whose sum is σ = 216862272. Its totient is φ = 207625600.

The previous prime is 212220901. The next prime is 212220919. The reversal of 212220917 is 719022212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212220917 - 2⁴ = 212220901 is a prime.

It is a super-2 number, since 2×212220917² = 90075435224641778, 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 (212220919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108 + ... + 20709.

It is an arithmetic number, because the mean of its divisors is an integer number (27107784).

Almost surely, 2^212220917 is an apocalyptic number.

It is an amenable number.

212220917 is a deficient number, since it is larger than the sum of its proper divisors (4641355).

212220917 is a wasteful number, since it uses less digits than its factorization.

212220917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23019.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 212220917 is about 14567.8041241637. The cubic root of 212220917 is about 596.4802416175.

The spelling of 212220917 in words is "two hundred twelve million, two hundred twenty thousand, nine hundred seventeen".