1981299210020 has 24 divisors (see below), whose sum is σ = 4480784367864. Its totient is φ = 731556631296.

The previous prime is 1981299210019. The next prime is 1981299210041. The reversal of 1981299210020 is 200129921891.

It can be written as a sum of positive squares in 4 ways, for example, as 103900496896 + 1877398713124 = 322336^2 + 1370182^2 .

It is a super-3 number, since 3×1981299210020³ (a number of 38 digits) contains 333 as substring.

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, 3810190529 + ... + 3810191048.

It is an arithmetic number, because the mean of its divisors is an integer number (186699348661).

Almost surely, 2^{1981299210020} is an apocalyptic number.

1981299210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1981299210020 is an abundant number, since it is smaller than the sum of its proper divisors (2499485157844).

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

1981299210020 is a wasteful number, since it uses less digits than its factorization.

1981299210020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7620381599 (or 7620381597 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 1981299210020 in words is "one trillion, nine hundred eighty-one billion, two hundred ninety-nine million, two hundred ten thousand, twenty".