1921928679172 has 36 divisors (see below), whose sum is σ = 3460156392420. Its totient is φ = 934066641024.

The previous prime is 1921928679163. The next prime is 1921928679193. The reversal of 1921928679172 is 2719768291291.

It can be written as a sum of positive squares in 6 ways, for example, as 58556256256 + 1863372422916 = 241984^2 + 1365054^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5373954 + ... + 5720422.

It is an arithmetic number, because the mean of its divisors is an integer number (96115455345).

Almost surely, 2^{1921928679172} is an apocalyptic number.

It is an amenable number.

1921928679172 is a deficient number, since it is larger than the sum of its proper divisors (1538227713248).

1921928679172 is a wasteful number, since it uses less digits than its factorization.

1921928679172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347560 (or 347521 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 64.

The spelling of 1921928679172 in words is "one trillion, nine hundred twenty-one billion, nine hundred twenty-eight million, six hundred seventy-nine thousand, one hundred seventy-two".