1021311040520 has 32 divisors (see below), whose sum is σ = 2298220288920. Its totient is φ = 408476336640.

The previous prime is 1021311040501. The next prime is 1021311040531. The reversal of 1021311040520 is 250401131201.

1021311040520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 999372098596 + 21938941924 = 999686^2 + 148118^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1021311040492 and 1021311040501.

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, 1157387 + ... + 1839066.

Almost surely, 2^{1021311040520} is an apocalyptic number.

1021311040520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021311040520 is an abundant number, since it is smaller than the sum of its proper divisors (1276909248400).

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

1021311040520 is a wasteful number, since it uses less digits than its factorization.

1021311040520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004985 (or 3004981 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 1021311040520 its reverse (250401131201), we get a palindrome (1271712171721).

The spelling of 1021311040520 in words is "one trillion, twenty-one billion, three hundred eleven million, forty thousand, five hundred twenty".