1320221052520 has 32 divisors (see below), whose sum is σ = 3072928314600. Its totient is φ = 509878475008.

The previous prime is 1320221052517. The next prime is 1320221052571. The reversal of 1320221052520 is 252501220231.

It can be written as a sum of positive squares in 4 ways, for example, as 1102966249284 + 217254803236 = 1050222^2 + 466106^2 .

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, 569059639 + ... + 569061958.

Almost surely, 2^{1320221052520} is an apocalyptic number.

1320221052520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320221052520 is an abundant number, since it is smaller than the sum of its proper divisors (1752707262080).

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

1320221052520 is a wasteful number, since it uses less digits than its factorization.

1320221052520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138121637 (or 1138121633 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 1320221052520 its reverse (252501220231), we get a palindrome (1572722272751).

The spelling of 1320221052520 in words is "one trillion, three hundred twenty billion, two hundred twenty-one million, fifty-two thousand, five hundred twenty".