8721212 has 6 divisors (see below), whose sum is σ = 15262128. Its totient is φ = 4360604.

The previous prime is 8721197. The next prime is 8721239. The reversal of 8721212 is 2121278.

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

8721212 is a modest number, since divided by 1212 gives 872 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090148 + ... + 1090155.

It is an arithmetic number, because the mean of its divisors is an integer number (2543688).

Almost surely, 2^8721212 is an apocalyptic number.

It is an amenable number.

8721212 is a deficient number, since it is larger than the sum of its proper divisors (6540916).

8721212 is a wasteful number, since it uses less digits than its factorization.

8721212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180307 (or 2180305 counting only the distinct ones).

The product of its digits is 448, while the sum is 23.

The square root of 8721212 is about 2953.1698224112. The cubic root of 8721212 is about 205.8380289633.

The spelling of 8721212 in words is "eight million, seven hundred twenty-one thousand, two hundred twelve".