1982289109021 has 8 divisors (see below), whose sum is σ = 2134859006840. Its totient is φ = 1829731514112.

The previous prime is 1982289109001. The next prime is 1982289109091. The reversal of 1982289109021 is 1209019822891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 142438308100 + 1839850800921 = 377410^2 + 1356411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1982289109021 - 2¹³ = 1982289100829 is a prime.

It is a super-2 number, since 2×1982289109021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1982289109021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982289109001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2739720 + ... + 3386833.

It is an arithmetic number, because the mean of its divisors is an integer number (266857375855).

Almost surely, 2^{1982289109021} is an apocalyptic number.

It is an amenable number.

1982289109021 is a deficient number, since it is larger than the sum of its proper divisors (152569897819).

1982289109021 is a wasteful number, since it uses less digits than its factorization.

1982289109021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6151455.

The product of its (nonzero) digits is 373248, while the sum is 52.

The spelling of 1982289109021 in words is "one trillion, nine hundred eighty-two billion, two hundred eighty-nine million, one hundred nine thousand, twenty-one".