2215416521 has 4 divisors (see below), whose sum is σ = 2215599492. Its totient is φ = 2215233552.

The previous prime is 2215416499. The next prime is 2215416527. The reversal of 2215416521 is 1256145122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1395396025 + 820020496 = 37355^2 + 28636^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215416521 - 2¹⁰ = 2215415497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2215416527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71930 + ... + 98003.

It is an arithmetic number, because the mean of its divisors is an integer number (553899873).

Almost surely, 2^2215416521 is an apocalyptic number.

It is an amenable number.

2215416521 is a deficient number, since it is larger than the sum of its proper divisors (182971).

2215416521 is a wasteful number, since it uses less digits than its factorization.

2215416521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182970.

The product of its digits is 4800, while the sum is 29.

The square root of 2215416521 is about 47068.2113639344. The cubic root of 2215416521 is about 1303.6223471429.

The spelling of 2215416521 in words is "two billion, two hundred fifteen million, four hundred sixteen thousand, five hundred twenty-one".