220161021 has 8 divisors (see below), whose sum is σ = 300707904. Its totient is φ = 143194080.

The previous prime is 220161013. The next prime is 220161031. The reversal of 220161021 is 120161022.

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

It is not a de Polignac number, because 220161021 - 2³ = 220161013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220161031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894841 + ... + 895086.

It is an arithmetic number, because the mean of its divisors is an integer number (37588488).

Almost surely, 2^220161021 is an apocalyptic number.

It is an amenable number.

220161021 is a deficient number, since it is larger than the sum of its proper divisors (80546883).

220161021 is a wasteful number, since it uses less digits than its factorization.

220161021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789971.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 220161021 is about 14837.8239981474. The cubic root of 220161021 is about 603.8283185654.

Subtracting from 220161021 its reverse (120161022), we obtain a palindrome (99999999).

The spelling of 220161021 in words is "two hundred twenty million, one hundred sixty-one thousand, twenty-one".