220146421 has 4 divisors (see below), whose sum is σ = 240159744. Its totient is φ = 200133100.

The previous prime is 220146397. The next prime is 220146427. The reversal of 220146421 is 124641022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220146421 - 2⁹ = 220145909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220146392 and 220146401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220146427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10006645 + ... + 10006666.

It is an arithmetic number, because the mean of its divisors is an integer number (60039936).

Almost surely, 2^220146421 is an apocalyptic number.

It is an amenable number.

220146421 is a deficient number, since it is larger than the sum of its proper divisors (20013323).

220146421 is a wasteful number, since it uses less digits than its factorization.

220146421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20013322.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 220146421 is about 14837.3320041037. The cubic root of 220146421 is about 603.8149706253.

Adding to 220146421 its reverse (124641022), we get a palindrome (344787443).

It can be divided in two parts, 220 and 146421, that added together give a palindrome (146641).

The spelling of 220146421 in words is "two hundred twenty million, one hundred forty-six thousand, four hundred twenty-one".