2111513006781 has 12 divisors (see below), whose sum is σ = 3050499987808. Its totient is φ = 1407427604424.

The previous prime is 2111513006767. The next prime is 2111513006783. The reversal of 2111513006781 is 1876003151112.

It is a happy number.

2111513006781 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 513 + 0 + 0 + 67 + 81 = 666.

It is not a de Polignac number, because 2111513006781 - 2¹⁵ = 2111512974013 is a prime.

It is a super-2 number, since 2×2111513006781² (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 (2111513006783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20590465 + ... + 20692758.

Almost surely, 2^{2111513006781} is an apocalyptic number.

It is an amenable number.

2111513006781 is a deficient number, since it is larger than the sum of its proper divisors (938986981027).

2111513006781 is a wasteful number, since it uses less digits than its factorization.

2111513006781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41288912 (or 41288909 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

Adding to 2111513006781 its reverse (1876003151112), we get a palindrome (3987516157893).

The spelling of 2111513006781 in words is "two trillion, one hundred eleven billion, five hundred thirteen million, six thousand, seven hundred eighty-one".