1019978128420 has 12 divisors (see below), whose sum is σ = 2141954069724. Its totient is φ = 407991251360.

The previous prime is 1019978128399. The next prime is 1019978128423. The reversal of 1019978128420 is 248218799101.

It can be written as a sum of positive squares in 2 ways, for example, as 456748892224 + 563229236196 = 675832^2 + 750486^2 .

It is not an unprimeable number, because it can be changed into a prime (1019978128423) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 25499453191 + ... + 25499453230.

It is an arithmetic number, because the mean of its divisors is an integer number (178496172477).

Almost surely, 2^{1019978128420} is an apocalyptic number.

1019978128420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1019978128420 is an abundant number, since it is smaller than the sum of its proper divisors (1121975941304).

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

1019978128420 is a wasteful number, since it uses less digits than its factorization.

1019978128420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50998906430 (or 50998906428 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 52.

The spelling of 1019978128420 in words is "one trillion, nineteen billion, nine hundred seventy-eight million, one hundred twenty-eight thousand, four hundred twenty".