2215521 has 48 divisors (see below), whose sum is σ = 4193280. Its totient is φ = 1092960.

The previous prime is 2215501. The next prime is 2215529. The reversal of 2215521 is 1255122.

It is not a de Polignac number, because 2215521 - 2⁷ = 2215393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2215494 and 2215503.

It is not an unprimeable number, because it can be changed into a prime (2215529) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15870 + ... + 16008.

It is an arithmetic number, because the mean of its divisors is an integer number (87360).

2^2215521 is an apocalyptic number.

2215521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2215521 is a deficient number, since it is larger than the sum of its proper divisors (1977759).

2215521 is a wasteful number, since it uses less digits than its factorization.

2215521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 183 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 2215521 is about 1488.4626296955. The cubic root of 2215521 is about 130.3642839756.

The spelling of 2215521 in words is "two million, two hundred fifteen thousand, five hundred twenty-one".