333220021 has 4 divisors (see below), whose sum is σ = 347707872. Its totient is φ = 318732172.

The previous prime is 333220001. The next prime is 333220033. The reversal of 333220021 is 120022333.

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: 120022333 = 1667 ⋅71999.

It is a cyclic number.

It is not a de Polignac number, because 333220021 - 2⁷ = 333219893 is a prime.

It is a super-2 number, since 2×333220021² = 222071164790480882, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 333220021 parts by 25815 straight cuts.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 333219977 and 333220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (333220001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7243891 + ... + 7243936.

It is an arithmetic number, because the mean of its divisors is an integer number (86926968).

Almost surely, 2^333220021 is an apocalyptic number.

It is an amenable number.

333220021 is a deficient number, since it is larger than the sum of its proper divisors (14487851).

333220021 is a wasteful number, since it uses less digits than its factorization.

333220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14487850.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 333220021 is about 18254.3151336883. The cubic root of 333220021 is about 693.2826990626.

Adding to 333220021 its reverse (120022333), we get a palindrome (453242354).

The spelling of 333220021 in words is "three hundred thirty-three million, two hundred twenty thousand, twenty-one".