1921888412028 has 144 divisors (see below), whose sum is σ = 5436346918912. Its totient is φ = 568483920000.

The previous prime is 1921888411987. The next prime is 1921888412029. The reversal of 1921888412028 is 8202148881291.

It is a happy number.

1921888412028 is a `hidden beast` number, since 1 + 9 + 218 + 8 + 8 + 412 + 0 + 2 + 8 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921888412029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1752063 + ... + 2629353.

Almost surely, 2^{1921888412028} is an apocalyptic number.

1921888412028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1921888412028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2718173459456).

1921888412028 is an abundant number, since it is smaller than the sum of its proper divisors (3514458506884).

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

1921888412028 is a wasteful number, since it uses less digits than its factorization.

1921888412028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877496 (or 877491 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 54.

The spelling of 1921888412028 in words is "one trillion, nine hundred twenty-one billion, eight hundred eighty-eight million, four hundred twelve thousand, twenty-eight".