2015012222521 has 4 divisors (see below), whose sum is σ = 2030393995344. Its totient is φ = 1999630449700.

The previous prime is 2015012222459. The next prime is 2015012222539. The reversal of 2015012222521 is 1252222105102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2015012222521 - 2⁹ = 2015012222009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2015012222551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7690886215 + ... + 7690886476.

It is an arithmetic number, because the mean of its divisors is an integer number (507598498836).

Almost surely, 2^{2015012222521} is an apocalyptic number.

It is an amenable number.

2015012222521 is a deficient number, since it is larger than the sum of its proper divisors (15381772823).

2015012222521 is a wasteful number, since it uses less digits than its factorization.

2015012222521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15381772822.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 2015012222521 its reverse (1252222105102), we get a palindrome (3267234327623).

The spelling of 2015012222521 in words is "two trillion, fifteen billion, twelve million, two hundred twenty-two thousand, five hundred twenty-one".