211556012 has 12 divisors (see below), whose sum is σ = 370620600. Its totient is φ = 105664416.

The previous prime is 211556003. The next prime is 211556027. The reversal of 211556012 is 210655112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24137 + ... + 31712.

It is an arithmetic number, because the mean of its divisors is an integer number (30885050).

Almost surely, 2^211556012 is an apocalyptic number.

It is an amenable number.

211556012 is a deficient number, since it is larger than the sum of its proper divisors (159064588).

211556012 is a wasteful number, since it uses less digits than its factorization.

211556012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56800 (or 56798 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 211556012 is about 14544.9651769951. The cubic root of 211556012 is about 595.8566499077.

The spelling of 211556012 in words is "two hundred eleven million, five hundred fifty-six thousand, twelve".