1928221212 has 12 divisors (see below), whose sum is σ = 4499182856. Its totient is φ = 642740400.

The previous prime is 1928221189. The next prime is 1928221237. The reversal of 1928221212 is 2121228291.

1928221212 is digitally balanced in base 4, because in such base 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 (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1928221212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80342539 + ... + 80342562.

Almost surely, 2^1928221212 is an apocalyptic number.

1928221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1928221212 is an abundant number, since it is smaller than the sum of its proper divisors (2570961644).

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

1928221212 is a wasteful number, since it uses less digits than its factorization.

1928221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160685108 (or 160685106 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 1928221212 is about 43911.5157105741. The cubic root of 1928221212 is about 1244.6644498206.

The spelling of 1928221212 in words is "one billion, nine hundred twenty-eight million, two hundred twenty-one thousand, two hundred twelve".