1115646221521 has 16 divisors (see below), whose sum is σ = 1240327836160. Its totient is φ = 996522082560.

The previous prime is 1115646221519. The next prime is 1115646221533. The reversal of 1115646221521 is 1251226465111.

It is a cyclic number.

It is not a de Polignac number, because 1115646221521 - 2¹ = 1115646221519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1115646221621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4876921 + ... + 5100553.

It is an arithmetic number, because the mean of its divisors is an integer number (77520489760).

Almost surely, 2^{1115646221521} is an apocalyptic number.

It is an amenable number.

1115646221521 is a deficient number, since it is larger than the sum of its proper divisors (124681614639).

1115646221521 is a wasteful number, since it uses less digits than its factorization.

1115646221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236056.

The product of its digits is 28800, while the sum is 37.

The spelling of 1115646221521 in words is "one trillion, one hundred fifteen billion, six hundred forty-six million, two hundred twenty-one thousand, five hundred twenty-one".