531021440000 has 110 divisors (see below), whose sum is σ = 1326482369454. Its totient is φ = 212408320000.

The previous prime is 531021439967. The next prime is 531021440021. The reversal of 531021440000 is 44120135.

It can be written as a sum of positive squares in 5 ways, for example, as 217708094464 + 313313345536 = 466592^2 + 559744^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 225140 + ... + 1054860.

Almost surely, 2^531021440000 is an apocalyptic number.

531021440000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531021440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (663241184727).

531021440000 is an abundant number, since it is smaller than the sum of its proper divisors (795460929454).

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

531021440000 is an frugal number, since it uses more digits than its factorization.

531021440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829761 (or 829728 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 531021440000 its reverse (44120135), we get a palindrome (531065560135).

The spelling of 531021440000 in words is "five hundred thirty-one billion, twenty-one million, four hundred forty thousand".