212181212 has 12 divisors (see below), whose sum is σ = 371616840. Its totient is φ = 106004976.

The previous prime is 212181173. The next prime is 212181223.

212181212 is nontrivially palindromic in base 10.

It is an alternating number because its digits alternate between even and odd.

It is a congruent 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, 15662 + ... + 25877.

It is an arithmetic number, because the mean of its divisors is an integer number (30968070).

Almost surely, 2^212181212 is an apocalyptic number.

It is an amenable number.

212181212 is a deficient number, since it is larger than the sum of its proper divisors (159435628).

212181212 is a wasteful number, since it uses less digits than its factorization.

212181212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42820 (or 42818 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

The square root of 212181212 is about 14566.4412949766. The cubic root of 212181212 is about 596.4430402497.

The spelling of 212181212 in words is "two hundred twelve million, one hundred eighty-one thousand, two hundred twelve".