2220421 has 16 divisors (see below), whose sum is σ = 2750976. Its totient is φ = 1748736.

The previous prime is 2220419. The next prime is 2220431. The reversal of 2220421 is 1240222.

It is a cyclic number.

It is not a de Polignac number, because 2220421 - 2¹ = 2220419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5395 + ... + 5791.

It is an arithmetic number, because the mean of its divisors is an integer number (171936).

2^2220421 is an apocalyptic number.

It is an amenable number.

2220421 is a deficient number, since it is larger than the sum of its proper divisors (530555).

2220421 is a wasteful number, since it uses less digits than its factorization.

2220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2220421 is about 1490.1077142274. The cubic root of 2220421 is about 130.4603207757.

Adding to 2220421 its reverse (1240222), we get a palindrome (3460643).

The spelling of 2220421 in words is "two million, two hundred twenty thousand, four hundred twenty-one".