2100512145520 has 40 divisors (see below), whose sum is σ = 4885442311680. Its totient is φ = 839903512320.

The previous prime is 2100512145481. The next prime is 2100512145521. The reversal of 2100512145520 is 255412150012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×2100512145520³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100512145521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4484016 + ... + 4930255.

It is an arithmetic number, because the mean of its divisors is an integer number (122136057792).

Almost surely, 2^{2100512145520} is an apocalyptic number.

2100512145520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100512145520 is an abundant number, since it is smaller than the sum of its proper divisors (2784930166160).

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

2100512145520 is a wasteful number, since it uses less digits than its factorization.

2100512145520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9417073 (or 9417067 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 2100512145520 its reverse (255412150012), we get a palindrome (2355924295532).

The spelling of 2100512145520 in words is "two trillion, one hundred billion, five hundred twelve million, one hundred forty-five thousand, five hundred twenty".