2145520520 has 64 divisors (see below), whose sum is σ = 5671391040. Its totient is φ = 720172800.

The previous prime is 2145520519. The next prime is 2145520541. The reversal of 2145520520 is 250255412.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 2145520520.

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, 181826 + ... + 193265.

It is an arithmetic number, because the mean of its divisors is an integer number (88615485).

Almost surely, 2^2145520520 is an apocalyptic number.

2145520520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145520520 is an abundant number, since it is smaller than the sum of its proper divisors (3525870520).

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

2145520520 is a wasteful number, since it uses less digits than its factorization.

2145520520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375126 (or 375122 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 2145520520 is about 46319.7638163236. The cubic root of 2145520520 is about 1289.7659010732.

Adding to 2145520520 its reverse (250255412), we get a palindrome (2395775932).

The spelling of 2145520520 in words is "two billion, one hundred forty-five million, five hundred twenty thousand, five hundred twenty".