2113660321521 has 48 divisors (see below), whose sum is σ = 3323837490624. Its totient is φ = 1191128150016.

The previous prime is 2113660321511. The next prime is 2113660321537. The reversal of 2113660321521 is 1251230663112.

It is not a de Polignac number, because 2113660321521 - 2³⁸ = 1838782414577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2113660321511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3773401 + ... + 4297193.

It is an arithmetic number, because the mean of its divisors is an integer number (69246614388).

Almost surely, 2^{2113660321521} is an apocalyptic number.

2113660321521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2113660321521 is a deficient number, since it is larger than the sum of its proper divisors (1210177169103).

2113660321521 is a wasteful number, since it uses less digits than its factorization.

2113660321521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524190 (or 524183 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

Adding to 2113660321521 its reverse (1251230663112), we get a palindrome (3364890984633).

The spelling of 2113660321521 in words is "two trillion, one hundred thirteen billion, six hundred sixty million, three hundred twenty-one thousand, five hundred twenty-one".