531221302140 has 48 divisors (see below), whose sum is σ = 1495126516128. Its totient is φ = 140925026304.

The previous prime is 531221302123. The next prime is 531221302177. The reversal of 531221302140 is 41203122135.

It is a self number, because there is not a number n which added to its sum of digits gives 531221302140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22925437 + ... + 22948596.

It is an arithmetic number, because the mean of its divisors is an integer number (31148469086).

Almost surely, 2^531221302140 is an apocalyptic number.

It is an amenable number.

531221302140 is an abundant number, since it is smaller than the sum of its proper divisors (963905213988).

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

531221302140 is a wasteful number, since it uses less digits than its factorization.

531221302140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45874238 (or 45874236 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 531221302140 its reverse (41203122135), we get a palindrome (572424424275).

The spelling of 531221302140 in words is "five hundred thirty-one billion, two hundred twenty-one million, three hundred two thousand, one hundred forty".