2221520 has 40 divisors (see below), whose sum is σ = 5904384. Its totient is φ = 761472.

The previous prime is 2221511. The next prime is 2221523. The reversal of 2221520 is 251222.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×2221520² = 9870302220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 2221495 and 2221504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221523) 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, 1424 + ... + 2543.

2^2221520 is an apocalyptic number.

2221520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221520 is an abundant number, since it is smaller than the sum of its proper divisors (3682864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2221520 is a wasteful number, since it uses less digits than its factorization.

2221520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987 (or 3981 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2221520 is about 1490.4764338962. The cubic root of 2221520 is about 130.4818410556.

Adding to 2221520 its reverse (251222), we get a palindrome (2472742).

The spelling of 2221520 in words is "two million, two hundred twenty-one thousand, five hundred twenty".