1220421443 has 8 divisors (see below), whose sum is σ = 1233392160. Its totient is φ = 1207483200.

The previous prime is 1220421439. The next prime is 1220421451. The reversal of 1220421443 is 3441240221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220421443 - 2² = 1220421439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220421403) 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, 71543 + ... + 86943.

It is an arithmetic number, because the mean of its divisors is an integer number (154174020).

Almost surely, 2^1220421443 is an apocalyptic number.

1220421443 is a deficient number, since it is larger than the sum of its proper divisors (12970717).

1220421443 is a wasteful number, since it uses less digits than its factorization.

1220421443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16237.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1220421443 is about 34934.5308112189. The cubic root of 1220421443 is about 1068.6527554305.

Adding to 1220421443 its reverse (3441240221), we get a palindrome (4661661664).

The spelling of 1220421443 in words is "one billion, two hundred twenty million, four hundred twenty-one thousand, four hundred forty-three".