1921930215828 has 24 divisors (see below), whose sum is σ = 5125147242432. Its totient is φ = 549122918784.

The previous prime is 1921930215787. The next prime is 1921930215883. The reversal of 1921930215828 is 8285120391291.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11440060725 + ... + 11440060892.

It is an arithmetic number, because the mean of its divisors is an integer number (213547801768).

Almost surely, 2^{1921930215828} is an apocalyptic number.

It is an amenable number.

1921930215828 is an abundant number, since it is smaller than the sum of its proper divisors (3203217026604).

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

1921930215828 is a wasteful number, since it uses less digits than its factorization.

1921930215828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22880121631 (or 22880121629 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 51.

The spelling of 1921930215828 in words is "one trillion, nine hundred twenty-one billion, nine hundred thirty million, two hundred fifteen thousand, eight hundred twenty-eight".