1520213320525 has 12 divisors (see below), whose sum is σ = 1892574742464. Its totient is φ = 1211325350000.

The previous prime is 1520213320433. The next prime is 1520213320529. The reversal of 1520213320525 is 5250233120251.

It is not a de Polignac number, because 1520213320525 - 2⁷ = 1520213320397 is a prime.

It is a super-2 number, since 2×1520213320525² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520213320529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121126261 + ... + 121138810.

It is an arithmetic number, because the mean of its divisors is an integer number (157714561872).

Almost surely, 2^{1520213320525} is an apocalyptic number.

It is an amenable number.

1520213320525 is a deficient number, since it is larger than the sum of its proper divisors (372361421939).

1520213320525 is a wasteful number, since it uses less digits than its factorization.

1520213320525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242265332 (or 242265327 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 1520213320525 its reverse (5250233120251), we get a palindrome (6770446440776).

The spelling of 1520213320525 in words is "one trillion, five hundred twenty billion, two hundred thirteen million, three hundred twenty thousand, five hundred twenty-five".