220396021 has 4 divisors (see below), whose sum is σ = 220737312. Its totient is φ = 220054732.

The previous prime is 220395997. The next prime is 220396061. The reversal of 220396021 is 120693022.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120693022 = 2 ⋅60346511.

It is a cyclic number.

It is not a de Polignac number, because 220396021 - 2⁷ = 220395893 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 (220396061) 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, 169675 + ... + 170968.

It is an arithmetic number, because the mean of its divisors is an integer number (55184328).

Almost surely, 2^220396021 is an apocalyptic number.

It is an amenable number.

220396021 is a deficient number, since it is larger than the sum of its proper divisors (341291).

220396021 is an equidigital number, since it uses as much as digits as its factorization.

220396021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341290.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 220396021 is about 14845.7408370212. The cubic root of 220396021 is about 604.0430844009.

The spelling of 220396021 in words is "two hundred twenty million, three hundred ninety-six thousand, twenty-one".