220145421 has 8 divisors (see below), whose sum is σ = 293634880. Its totient is φ = 146709792.

The previous prime is 220145383. The next prime is 220145503. The reversal of 220145421 is 124541022.

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

It is not a de Polignac number, because 220145421 - 2⁹ = 220144909 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 (220145221) 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, 2680 + ... + 21153.

It is an arithmetic number, because the mean of its divisors is an integer number (36704360).

Almost surely, 2^220145421 is an apocalyptic number.

It is an amenable number.

220145421 is a deficient number, since it is larger than the sum of its proper divisors (73489459).

220145421 is a wasteful number, since it uses less digits than its factorization.

220145421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26915.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 220145421 is about 14837.2983052846. The cubic root of 220145421 is about 603.8140563613.

Adding to 220145421 its reverse (124541022), we get a palindrome (344686443).

The spelling of 220145421 in words is "two hundred twenty million, one hundred forty-five thousand, four hundred twenty-one".