212161212 has 18 divisors (see below), whose sum is σ = 536296488. Its totient is φ = 70720392.

The previous prime is 212161211. The next prime is 212161267.

212161212 is a `hidden beast` number, since 21 + 21 + 612 + 12 = 666.

212161212 is nontrivially palindromic in base 10.

212161212 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212161211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2946648 + ... + 2946719.

Almost surely, 2^212161212 is an apocalyptic number.

It is an amenable number.

212161212 is an abundant number, since it is smaller than the sum of its proper divisors (324135276).

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

212161212 is a wasteful number, since it uses less digits than its factorization.

212161212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5893377 (or 5893372 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 212161212 is about 14565.7547693211. The cubic root of 212161212 is about 596.4242996090.

The spelling of 212161212 in words is "two hundred twelve million, one hundred sixty-one thousand, two hundred twelve".