1213522045520 has 20 divisors (see below), whose sum is σ = 2821438756020. Its totient is φ = 485408818176.

The previous prime is 1213522045501. The next prime is 1213522045543. The reversal of 1213522045520 is 255402253121.

It can be written as a sum of positive squares in 2 ways, for example, as 209694389776 + 1003827655744 = 457924^2 + 1001912^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7584512705 + ... + 7584512864.

It is an arithmetic number, because the mean of its divisors is an integer number (141071937801).

Almost surely, 2^{1213522045520} is an apocalyptic number.

1213522045520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213522045520 is an abundant number, since it is smaller than the sum of its proper divisors (1607916710500).

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

1213522045520 is a wasteful number, since it uses less digits than its factorization.

1213522045520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15169025582 (or 15169025576 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 1213522045520 its reverse (255402253121), we get a palindrome (1468924298641).

The spelling of 1213522045520 in words is "one trillion, two hundred thirteen billion, five hundred twenty-two million, forty-five thousand, five hundred twenty".