212216467221 has 36 divisors (see below), whose sum is σ = 347803980160. Its totient is φ = 124467116400.

The previous prime is 212216467187. The next prime is 212216467247. The reversal of 212216467221 is 122764612212.

212216467221 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 1 + 646 + 7 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 212216467221 - 2⁷ = 212216467093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212216467921) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3109351 + ... + 3176868.

Almost surely, 2^212216467221 is an apocalyptic number.

It is an amenable number.

212216467221 is a deficient number, since it is larger than the sum of its proper divisors (135587512939).

212216467221 is a wasteful number, since it uses less digits than its factorization.

212216467221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6286278 (or 6286264 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The spelling of 212216467221 in words is "two hundred twelve billion, two hundred sixteen million, four hundred sixty-seven thousand, two hundred twenty-one".