11512015662021 has 48 divisors (see below), whose sum is σ = 19014360004224. Its totient is φ = 6063634194048.

The previous prime is 11512015661963. The next prime is 11512015662031. The reversal of 11512015662021 is 12026651021511.

It is a happy number.

It is not a de Polignac number, because 11512015662021 - 2⁷ = 11512015661893 is a prime.

It is a super-3 number, since 3×11512015662021³ (a number of 40 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11512015662031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20240250 + ... + 20801243.

It is an arithmetic number, because the mean of its divisors is an integer number (396132500088).

Almost surely, 2^{11512015662021} is an apocalyptic number.

It is an amenable number.

11512015662021 is a deficient number, since it is larger than the sum of its proper divisors (7502344342203).

11512015662021 is a wasteful number, since it uses less digits than its factorization.

11512015662021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41041578 (or 41041559 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

Adding to 11512015662021 its reverse (12026651021511), we get a palindrome (23538666683532).

The spelling of 11512015662021 in words is "eleven trillion, five hundred twelve billion, fifteen million, six hundred sixty-two thousand, twenty-one".