2015040511721 has 8 divisors (see below), whose sum is σ = 2016547682688. Its totient is φ = 2013533892000.

The previous prime is 2015040511697. The next prime is 2015040511789. The reversal of 2015040511721 is 1271150405102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2015040511721 - 2³⁴ = 1997860642537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2015040519721) 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, 7326116 + ... + 7596186.

It is an arithmetic number, because the mean of its divisors is an integer number (252068460336).

Almost surely, 2^{2015040511721} is an apocalyptic number.

It is an amenable number.

2015040511721 is a deficient number, since it is larger than the sum of its proper divisors (1507170967).

2015040511721 is a wasteful number, since it uses less digits than its factorization.

2015040511721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275623.

The product of its (nonzero) digits is 2800, while the sum is 29.

Adding to 2015040511721 its reverse (1271150405102), we get a palindrome (3286190916823).

The spelling of 2015040511721 in words is "two trillion, fifteen billion, forty million, five hundred eleven thousand, seven hundred twenty-one".