211221049212 has 18 divisors (see below), whose sum is σ = 533919874488. Its totient is φ = 70407016392.

The previous prime is 211221049153. The next prime is 211221049231. The reversal of 211221049212 is 212940122112.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×211221049212² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2933625648 + ... + 2933625719.

Almost surely, 2^211221049212 is an apocalyptic number.

It is an amenable number.

211221049212 is an abundant number, since it is smaller than the sum of its proper divisors (322698825276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221049212 is a wasteful number, since it uses less digits than its factorization.

211221049212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5867251377 (or 5867251372 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 211221049212 in words is "two hundred eleven billion, two hundred twenty-one million, forty-nine thousand, two hundred twelve".