1921136912 has 40 divisors (see below), whose sum is σ = 3815793720. Its totient is φ = 936714240.

The previous prime is 1921136897. The next prime is 1921136927. The reversal of 1921136912 is 2196311291.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1921136897) and next prime (1921136927).

It can be written as a sum of positive squares in 4 ways, for example, as 500148496 + 1420988416 = 22364^2 + 37696^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 94712 + ... + 113192.

It is an arithmetic number, because the mean of its divisors is an integer number (95394843).

Almost surely, 2^1921136912 is an apocalyptic number.

It is an amenable number.

1921136912 is a deficient number, since it is larger than the sum of its proper divisors (1894656808).

1921136912 is a wasteful number, since it uses less digits than its factorization.

1921136912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18651 (or 18645 counting only the distinct ones).

The product of its digits is 5832, while the sum is 35.

The square root of 1921136912 is about 43830.7758544154. The cubic root of 1921136912 is about 1243.1382768868.

The spelling of 1921136912 in words is "one billion, nine hundred twenty-one million, one hundred thirty-six thousand, nine hundred twelve".