1021744165540 has 48 divisors (see below), whose sum is σ = 2452368844800. Its totient is φ = 350286164352.

The previous prime is 1021744165511. The next prime is 1021744165543. The reversal of 1021744165540 is 455614471201.

It is a happy number.

It is a super-2 number, since 2×1021744165540² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021744165493 and 1021744165502.

It is not an unprimeable number, because it can be changed into a prime (1021744165543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1661046 + ... + 2191474.

It is an arithmetic number, because the mean of its divisors is an integer number (51091017600).

Almost surely, 2^{1021744165540} is an apocalyptic number.

1021744165540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021744165540 is an abundant number, since it is smaller than the sum of its proper divisors (1430624679260).

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

1021744165540 is a wasteful number, since it uses less digits than its factorization.

1021744165540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544204 (or 544202 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 1021744165540 in words is "one trillion, twenty-one billion, seven hundred forty-four million, one hundred sixty-five thousand, five hundred forty".