333220421 has 4 divisors (see below), whose sum is σ = 333295200. Its totient is φ = 333145644.

The previous prime is 333220387. The next prime is 333220429. The reversal of 333220421 is 124022333.

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 333220421 - 2⁶ = 333220357 is a prime.

It is a super-2 number, since 2×333220421² = 222071697942834482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 333220393 and 333220402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (333220429) 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, 30251 + ... + 39768.

It is an arithmetic number, because the mean of its divisors is an integer number (83323800).

Almost surely, 2^333220421 is an apocalyptic number.

It is an amenable number.

333220421 is a deficient number, since it is larger than the sum of its proper divisors (74779).

333220421 is an equidigital number, since it uses as much as digits as its factorization.

333220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74778.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 333220421 is about 18254.3260899985. The cubic root of 333220421 is about 693.2829764698.

Adding to 333220421 its reverse (124022333), we get a palindrome (457242754).

The spelling of 333220421 in words is "three hundred thirty-three million, two hundred twenty thousand, four hundred twenty-one".