921212 has 6 divisors (see below), whose sum is σ = 1612128. Its totient is φ = 460604.

The previous prime is 921203. The next prime is 921223. The reversal of 921212 is 212129.

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

921212 is a modest number, since divided by 1212 gives 92 as remainder.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115148 + ... + 115155.

It is an arithmetic number, because the mean of its divisors is an integer number (268688).

2⁹²¹²¹² is an apocalyptic number.

It is an amenable number.

921212 is a deficient number, since it is larger than the sum of its proper divisors (690916).

921212 is a wasteful number, since it uses less digits than its factorization.

921212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230307 (or 230305 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 921212 is about 959.7978953926. The cubic root of 921212 is about 97.3015732160.

The spelling of 921212 in words is "nine hundred twenty-one thousand, two hundred twelve".