2220521 has 2 divisors, whose sum is σ = 2220522. Its totient is φ = 2220520.

The previous prime is 2220503. The next prime is 2220527. The reversal of 2220521 is 1250222.

2220521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2088025 + 132496 = 1445^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220521 - 2⁶ = 2220457 is a prime.

It is a super-2 number, since 2×2220521² = 9861427022882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2220496 and 2220505.

It is not a weakly prime, because it can be changed into another prime (2220527) 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 as a sum of consecutive naturals, namely, 1110260 + 1110261.

It is an arithmetic number, because the mean of its divisors is an integer number (1110261).

2^2220521 is an apocalyptic number.

It is an amenable number.

2220521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220521 is an equidigital number, since it uses as much as digits as its factorization.

2220521 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2220521 is about 1490.1412684709. The cubic root of 2220521 is about 130.4622792385.

Adding to 2220521 its reverse (1250222), we get a palindrome (3470743).

Subtracting from 2220521 its reverse (1250222), we obtain a cube (970299 = 99³).

The spelling of 2220521 in words is "two million, two hundred twenty thousand, five hundred twenty-one".