1020240045521 has 4 divisors (see below), whose sum is σ = 1020242353572. Its totient is φ = 1020237737472.

The previous prime is 1020240045431. The next prime is 1020240045553. The reversal of 1020240045521 is 1255400420201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 408659740225 + 611580305296 = 639265^2 + 782036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020240045521 - 2³⁴ = 1003060176337 is a prime.

It is a super-2 number, since 2×1020240045521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1020240345521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260216 + ... + 1451961.

It is an arithmetic number, because the mean of its divisors is an integer number (255060588393).

Almost surely, 2^{1020240045521} is an apocalyptic number.

It is an amenable number.

1020240045521 is a deficient number, since it is larger than the sum of its proper divisors (2308051).

1020240045521 is an equidigital number, since it uses as much as digits as its factorization.

1020240045521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308050.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 1020240045521 its reverse (1255400420201), we get a palindrome (2275640465722).

The spelling of 1020240045521 in words is "one trillion, twenty billion, two hundred forty million, forty-five thousand, five hundred twenty-one".